431638442 has 4 divisors (see below), whose sum is σ = 647457666. Its totient is φ = 215819220.

The previous prime is 431638423. The next prime is 431638453. The reversal of 431638442 is 244836134.

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

It can be written as a sum of positive squares in only one way, i.e., 226833721 + 204804721 = 15061^2 + 14311^2 .

It is a super-2 number, since 2×431638442² = 372623489224374728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107909609 + ... + 107909612.

Almost surely, 2^431638442 is an apocalyptic number.

431638442 is a deficient number, since it is larger than the sum of its proper divisors (215819224).

431638442 is a wasteful number, since it uses less digits than its factorization.

431638442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215819223.

The product of its digits is 55296, while the sum is 35.

The square root of 431638442 is about 20775.9101365018. The cubic root of 431638442 is about 755.7416754559.

The spelling of 431638442 in words is "four hundred thirty-one million, six hundred thirty-eight thousand, four hundred forty-two".