397860901 has 4 divisors (see below), whose sum is σ = 400993792. Its totient is φ = 394728012.

The previous prime is 397860887. The next prime is 397860919. The reversal of 397860901 is 109068793.

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: 109068793 = 61 ⋅1788013.

It is a cyclic number.

It is not a de Polignac number, because 397860901 - 2⁹ = 397860389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397860301) 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, 1566255 + ... + 1566508.

It is an arithmetic number, because the mean of its divisors is an integer number (100248448).

Almost surely, 2^397860901 is an apocalyptic number.

It is an amenable number.

397860901 is a deficient number, since it is larger than the sum of its proper divisors (3132891).

397860901 is a wasteful number, since it uses less digits than its factorization.

397860901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132890.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 397860901 is about 19946.4508371790. The cubic root of 397860901 is about 735.4905334556.

The spelling of 397860901 in words is "three hundred ninety-seven million, eight hundred sixty thousand, nine hundred one".