397929630 has 64 divisors (see below), whose sum is σ = 1109998080. Its totient is φ = 89410944.

The previous prime is 397929629. The next prime is 397929691. The reversal of 397929630 is 36929793.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 397929630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3669 + ... + 28448.

It is an arithmetic number, because the mean of its divisors is an integer number (17343720).

Almost surely, 2^397929630 is an apocalyptic number.

397929630 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 397929630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554999040).

397929630 is an abundant number, since it is smaller than the sum of its proper divisors (712068450).

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

397929630 is a wasteful number, since it uses less digits than its factorization.

397929630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32193.

The product of its (nonzero) digits is 551124, while the sum is 48.

The square root of 397929630 is about 19948.1736006082. The cubic root of 397929630 is about 735.5328821075.

The spelling of 397929630 in words is "three hundred ninety-seven million, nine hundred twenty-nine thousand, six hundred thirty".