397528691 has 8 divisors (see below), whose sum is σ = 454517760. Its totient is φ = 340589448.

The previous prime is 397528631. The next prime is 397528693. The reversal of 397528691 is 196825793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397528691 - 2¹⁸ = 397266547 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6590 + ... + 28956.

It is an arithmetic number, because the mean of its divisors is an integer number (56814720).

Almost surely, 2^397528691 is an apocalyptic number.

397528691 is a deficient number, since it is larger than the sum of its proper divisors (56989069).

397528691 is a wasteful number, since it uses less digits than its factorization.

397528691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24913.

The product of its digits is 816480, while the sum is 50.

The square root of 397528691 is about 19938.1215514401. The cubic root of 397528691 is about 735.2857672944.

The spelling of 397528691 in words is "three hundred ninety-seven million, five hundred twenty-eight thousand, six hundred ninety-one".