397912500 has 216 divisors, whose sum is σ = 1313728416. Its totient is φ = 105300000.

The previous prime is 397912483. The next prime is 397912513. The reversal of 397912500 is 5219793.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3037435 + ... + 3037565.

It is an arithmetic number, because the mean of its divisors is an integer number (6082076).

Almost surely, 2^397912500 is an apocalyptic number.

397912500 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 397912500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656864208).

397912500 is an abundant number, since it is smaller than the sum of its proper divisors (915815916).

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

397912500 is an equidigital number, since it uses as much as digits as its factorization.

397912500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 397912500 is about 19947.7442333714. The cubic root of 397912500 is about 735.5223275955.

The spelling of 397912500 in words is "three hundred ninety-seven million, nine hundred twelve thousand, five hundred".