638477 has 8 divisors (see below), whose sum is σ = 734976. Its totient is φ = 543312.

The previous prime is 638467. The next prime is 638489. The reversal of 638477 is 774836.

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

It is not a de Polignac number, because 638477 - 2¹⁶ = 572941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 1610.

It is an arithmetic number, because the mean of its divisors is an integer number (91872).

2⁶³⁸⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

638477 is a deficient number, since it is larger than the sum of its proper divisors (96499).

638477 is a wasteful number, since it uses less digits than its factorization.

638477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667.

The product of its digits is 28224, while the sum is 35.

The square root of 638477 is about 799.0475580339. The cubic root of 638477 is about 86.1089748882.

It can be divided in two parts, 6 and 38477, that added together give a palindrome (38483).

The spelling of 638477 in words is "six hundred thirty-eight thousand, four hundred seventy-seven".