397292280 has 512 divisors, whose sum is σ = 1636761600. Its totient is φ = 74649600.

The previous prime is 397292279. The next prime is 397292281. The reversal of 397292280 is 82292793.

It is an interprime number because it is at equal distance from previous prime (397292279) and next prime (397292281).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397292281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5442324 + ... + 5442396.

It is an arithmetic number, because the mean of its divisors is an integer number (3196800).

Almost surely, 2^397292280 is an apocalyptic number.

397292280 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 397292280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818380800).

397292280 is an abundant number, since it is smaller than the sum of its proper divisors (1239469320).

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

397292280 is a wasteful number, since it uses less digits than its factorization.

397292280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 397292280 is about 19932.1920520549. The cubic root of 397292280 is about 735.1399798181.

The spelling of 397292280 in words is "three hundred ninety-seven million, two hundred ninety-two thousand, two hundred eighty".