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397322640 = 24325111317227
BaseRepresentation
bin10111101011101…
…010100110010000
31000200122002012100
4113223222212100
51303203311030
6103232000400
712563121021
oct2753524620
91020562170
10397322640
11194307420
12b1090100
1364414a70
143aaa8c48
1524d35360
hex17aea990

397322640 has 480 divisors, whose sum is σ = 1667143296. Its totient is φ = 83312640.

The previous prime is 397322617. The next prime is 397322659. The reversal of 397322640 is 46223793.

It is a happy number.

397322640 is a `hidden beast` number, since 3 + 9 + 7 + 3 + 2 + 2 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 397322595 and 397322604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1750207 + ... + 1750433.

Almost surely, 2397322640 is an apocalyptic number.

397322640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397322640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833571648).

397322640 is an abundant number, since it is smaller than the sum of its proper divisors (1269820656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397322640 is a wasteful number, since it uses less digits than its factorization.

397322640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 397322640 is about 19932.9536195718. The cubic root of 397322640 is about 735.1587051432.

The spelling of 397322640 in words is "three hundred ninety-seven million, three hundred twenty-two thousand, six hundred forty".