397135887 has 4 divisors (see below), whose sum is σ = 529514520. Its totient is φ = 264757256.

The previous prime is 397135883. The next prime is 397135919. The reversal of 397135887 is 788531793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397135887 - 2² = 397135883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397135883) 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, 66189312 + ... + 66189317.

It is an arithmetic number, because the mean of its divisors is an integer number (132378630).

Almost surely, 2^397135887 is an apocalyptic number.

397135887 is a deficient number, since it is larger than the sum of its proper divisors (132378633).

397135887 is a wasteful number, since it uses less digits than its factorization.

397135887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132378632.

The product of its digits is 1270080, while the sum is 51.

The square root of 397135887 is about 19928.2685399409. The cubic root of 397135887 is about 735.0435052225.

The spelling of 397135887 in words is "three hundred ninety-seven million, one hundred thirty-five thousand, eight hundred eighty-seven".