397596690 has 72 divisors (see below), whose sum is σ = 1049370660. Its totient is φ = 104447232.

The previous prime is 397596677. The next prime is 397596743. The reversal of 397596690 is 96695793.

It can be written as a sum of positive squares in 6 ways, for example, as 212663889 + 184932801 = 14583^2 + 13599^2 .

It is a super-2 number, since 2×397596690² = 316166255797912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 479196 + ... + 480024.

Almost surely, 2^397596690 is an apocalyptic number.

397596690 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 397596690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (524685330).

397596690 is an abundant number, since it is smaller than the sum of its proper divisors (651773970).

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

397596690 is a wasteful number, since it uses less digits than its factorization.

397596690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The square root of 397596690 is about 19939.8267294377. The cubic root of 397596690 is about 735.3276895065.

The spelling of 397596690 in words is "three hundred ninety-seven million, five hundred ninety-six thousand, six hundred ninety".