397976529 has 4 divisors (see below), whose sum is σ = 530635376. Its totient is φ = 265317684.

The previous prime is 397976519. The next prime is 397976569. The reversal of 397976529 is 925679793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 397976529 - 2⁵ = 397976497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397976519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66329419 + ... + 66329424.

It is an arithmetic number, because the mean of its divisors is an integer number (132658844).

Almost surely, 2^397976529 is an apocalyptic number.

It is an amenable number.

397976529 is a deficient number, since it is larger than the sum of its proper divisors (132658847).

397976529 is a wasteful number, since it uses less digits than its factorization.

397976529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132658846.

The product of its digits is 6429780, while the sum is 57.

The square root of 397976529 is about 19949.3490871256. The cubic root of 397976529 is about 735.5617769999.

It can be divided in two parts, 3979 and 76529, that added together give a palindrome (80508).

The spelling of 397976529 in words is "three hundred ninety-seven million, nine hundred seventy-six thousand, five hundred twenty-nine".