431638 has 8 divisors (see below), whose sum is σ = 653832. Its totient is φ = 213696.

The previous prime is 431621. The next prime is 431657. The reversal of 431638 is 836134.

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

It is a super-2 number, since 2×431638² = 372622726088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (81729).

2⁴³¹⁶³⁸ is an apocalyptic number.

431638 is a deficient number, since it is larger than the sum of its proper divisors (222194).

431638 is a wasteful number, since it uses less digits than its factorization.

431638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126.

The product of its digits is 1728, while the sum is 25.

The square root of 431638 is about 656.9916285616. The cubic root of 431638 is about 75.5741417495.

Subtracting 431638 from its reverse (836134), we obtain a square (404496 = 636²).

It can be divided in two parts, 43 and 1638, that added together give a square (1681 = 41²).

The spelling of 431638 in words is "four hundred thirty-one thousand, six hundred thirty-eight".