397528690 has 16 divisors (see below), whose sum is σ = 770594328. Its totient is φ = 146779776.

The previous prime is 397528631. The next prime is 397528693. The reversal of 397528690 is 96825793.

It can be written as a sum of positive squares in 4 ways, for example, as 126630009 + 270898681 = 11253^2 + 16459^2 .

It is a super-2 number, since 2×397528690² = 316058118746232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397528693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1528827 + ... + 1529086.

Almost surely, 2^397528690 is an apocalyptic number.

397528690 is a deficient number, since it is larger than the sum of its proper divisors (373065638).

397528690 is a wasteful number, since it uses less digits than its factorization.

397528690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057933.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 397528690 is about 19938.1215263625. The cubic root of 397528690 is about 735.2857666779.

The spelling of 397528690 in words is "three hundred ninety-seven million, five hundred twenty-eight thousand, six hundred ninety".