638377 has 4 divisors (see below), whose sum is σ = 660420. Its totient is φ = 616336.

The previous prime is 638371. The next prime is 638423. The reversal of 638377 is 773836.

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

It can be written as a sum of positive squares in 2 ways, for example, as 389376 + 249001 = 624^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 638377 - 2¹⁵ = 605609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638371) 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, 10978 + ... + 11035.

It is an arithmetic number, because the mean of its divisors is an integer number (165105).

2⁶³⁸³⁷⁷ is an apocalyptic number.

It is an amenable number.

638377 is a deficient number, since it is larger than the sum of its proper divisors (22043).

638377 is a wasteful number, since it uses less digits than its factorization.

638377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22042.

The product of its digits is 21168, while the sum is 34.

The square root of 638377 is about 798.9849810854. The cubic root of 638377 is about 86.1044791131.

It can be divided in two parts, 6 and 38377, that added together give a palindrome (38383).

The spelling of 638377 in words is "six hundred thirty-eight thousand, three hundred seventy-seven".