397681830 has 192 divisors, whose sum is σ = 1295723520. Its totient is φ = 82384128.

The previous prime is 397681829. The next prime is 397681841. The reversal of 397681830 is 38186793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

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, 482799 + ... + 483621.

It is an arithmetic number, because the mean of its divisors is an integer number (6748560).

Almost surely, 2^397681830 is an apocalyptic number.

397681830 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 397681830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647861760).

397681830 is an abundant number, since it is smaller than the sum of its proper divisors (898041690).

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

397681830 is a wasteful number, since it uses less digits than its factorization.

397681830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 397681830 is about 19941.9615384244. The cubic root of 397681830 is about 735.3801726156.

The spelling of 397681830 in words is "three hundred ninety-seven million, six hundred eighty-one thousand, eight hundred thirty".