638953 has 8 divisors (see below), whose sum is σ = 750272. Its totient is φ = 532656.

The previous prime is 638933. The next prime is 638959. The reversal of 638953 is 359836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638959) 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, 975 + ... + 1492.

It is an arithmetic number, because the mean of its divisors is an integer number (93784).

2⁶³⁸⁹⁵³ is an apocalyptic number.

It is an amenable number.

638953 is a deficient number, since it is larger than the sum of its proper divisors (111319).

638953 is a wasteful number, since it uses less digits than its factorization.

638953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511.

The product of its digits is 19440, while the sum is 34.

The square root of 638953 is about 799.3453571517. The cubic root of 638953 is about 86.1303683451.

The spelling of 638953 in words is "six hundred thirty-eight thousand, nine hundred fifty-three".