864629397 has 20 divisors (see below), whose sum is σ = 1292454240. Its totient is φ = 576041544.

The previous prime is 864629321. The next prime is 864629399. The reversal of 864629397 is 793926468.

It is a happy number.

864629397 is a `hidden beast` number, since 8 + 6 + 4 + 629 + 3 + 9 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-864629397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864629399) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 179304 + ... + 184062.

It is an arithmetic number, because the mean of its divisors is an integer number (64622712).

Almost surely, 2^864629397 is an apocalyptic number.

It is an amenable number.

864629397 is a deficient number, since it is larger than the sum of its proper divisors (427824843).

864629397 is a wasteful number, since it uses less digits than its factorization.

864629397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014 (or 7005 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 864629397 is about 29404.5812247003. The cubic root of 864629397 is about 952.6718494569.

It can be divided in two parts, 86462 and 9397, that added together give a palindrome (95859).

The spelling of 864629397 in words is "eight hundred sixty-four million, six hundred twenty-nine thousand, three hundred ninety-seven".