638877 has 8 divisors (see below), whose sum is σ = 902016. Its totient is φ = 400832.

The previous prime is 638861. The next prime is 638893. The reversal of 638877 is 778836.

It is an interprime number because it is at equal distance from previous prime (638861) and next prime (638893).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638877 - 2⁴ = 638861 is a prime.

It is a super-2 number, since 2×638877² = 816327642258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6213 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (112752).

2⁶³⁸⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

638877 is a deficient number, since it is larger than the sum of its proper divisors (263139).

638877 is a wasteful number, since it uses less digits than its factorization.

638877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12547.

The product of its digits is 56448, while the sum is 39.

The square root of 638877 is about 799.2978168368. The cubic root of 638877 is about 86.1269532960.

It can be divided in two parts, 6 and 38877, that added together give a palindrome (38883).

The spelling of 638877 in words is "six hundred thirty-eight thousand, eight hundred seventy-seven".