397880929 has 4 divisors (see below), whose sum is σ = 400918320. Its totient is φ = 394843540.

The previous prime is 397880921. The next prime is 397880941. The reversal of 397880929 is 929088793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 929088793 = 15131 ⋅61403.

It is a cyclic number.

It is not a de Polignac number, because 397880929 - 2³ = 397880921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397880929.

It is not an unprimeable number, because it can be changed into a prime (397880921) 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 3 ways as a sum of consecutive naturals, for example, 1518499 + ... + 1518760.

It is an arithmetic number, because the mean of its divisors is an integer number (100229580).

Almost surely, 2^397880929 is an apocalyptic number.

It is an amenable number.

397880929 is a deficient number, since it is larger than the sum of its proper divisors (3037391).

397880929 is a wasteful number, since it uses less digits than its factorization.

397880929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037390.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 397880929 is about 19946.9528750634. The cubic root of 397880929 is about 735.5028745838.

The spelling of 397880929 in words is "three hundred ninety-seven million, eight hundred eighty thousand, nine hundred twenty-nine".