638124697 has 24 divisors (see below), whose sum is σ = 764854272. Its totient is φ = 530510400.

The previous prime is 638124691. The next prime is 638124703. The reversal of 638124697 is 796421836.

It is an interprime number because it is at equal distance from previous prime (638124691) and next prime (638124703).

It is not a de Polignac number, because 638124697 - 2³ = 638124689 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (638124691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 382888 + ... + 384550.

It is an arithmetic number, because the mean of its divisors is an integer number (31868928).

Almost surely, 2^638124697 is an apocalyptic number.

It is an amenable number.

638124697 is a deficient number, since it is larger than the sum of its proper divisors (126729575).

638124697 is a wasteful number, since it uses less digits than its factorization.

638124697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909 (or 1902 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 638124697 is about 25261.1301607826. The cubic root of 638124697 is about 860.9313405051.

The spelling of 638124697 in words is "six hundred thirty-eight million, one hundred twenty-four thousand, six hundred ninety-seven".