397072830 has 256 divisors, whose sum is σ = 1277337600. Its totient is φ = 76515840.

The previous prime is 397072813. The next prime is 397072853. The reversal of 397072830 is 38270793.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3642816 + ... + 3642924.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^397072830 is an apocalyptic number.

397072830 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 397072830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638668800).

397072830 is an abundant number, since it is smaller than the sum of its proper divisors (880264770).

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

397072830 is a wasteful number, since it uses less digits than its factorization.

397072830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 397072830 is about 19926.6863778201. The cubic root of 397072830 is about 735.0045999064.

The spelling of 397072830 in words is "three hundred ninety-seven million, seventy-two thousand, eight hundred thirty".