397362840 has 128 divisors (see below), whose sum is σ = 1366848000. Its totient is φ = 90528768.

The previous prime is 397362829. The next prime is 397362841. The reversal of 397362840 is 48263793.

It is a super-2 number, since 2×397362840² = 315794453225731200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 397362792 and 397362801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397362841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351396 + ... + 352524.

It is an arithmetic number, because the mean of its divisors is an integer number (10678500).

Almost surely, 2^397362840 is an apocalyptic number.

397362840 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 397362840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683424000).

397362840 is an abundant number, since it is smaller than the sum of its proper divisors (969485160).

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

397362840 is a wasteful number, since it uses less digits than its factorization.

397362840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 397362840 is about 19933.9619744796. The cubic root of 397362840 is about 735.1834980783.

The spelling of 397362840 in words is "three hundred ninety-seven million, three hundred sixty-two thousand, eight hundred forty".