397477687 has 4 divisors (see below), whose sum is σ = 404977320. Its totient is φ = 389978056.

The previous prime is 397477679. The next prime is 397477733. The reversal of 397477687 is 786774793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786774793 = 7 ⋅112396399.

It is a cyclic number.

It is not a de Polignac number, because 397477687 - 2³ = 397477679 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397471687) 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, 3749737 + ... + 3749842.

It is an arithmetic number, because the mean of its divisors is an integer number (101244330).

Almost surely, 2^397477687 is an apocalyptic number.

397477687 is a deficient number, since it is larger than the sum of its proper divisors (7499633).

397477687 is an equidigital number, since it uses as much as digits as its factorization.

397477687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499632.

The product of its digits is 12446784, while the sum is 58.

The square root of 397477687 is about 19936.8424531068. The cubic root of 397477687 is about 735.2543195691.

The spelling of 397477687 in words is "three hundred ninety-seven million, four hundred seventy-seven thousand, six hundred eighty-seven".