638244231 has 8 divisors (see below), whose sum is σ = 851140224. Its totient is φ = 425422200.

The previous prime is 638244203. The next prime is 638244251. The reversal of 638244231 is 132442836.

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

It is not a de Polignac number, because 638244231 - 2⁵ = 638244199 is a prime.

It is a super-2 number, since 2×638244231² = 814711396809562722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638244192 and 638244201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638244251) 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, 6456 + ... + 36306.

It is an arithmetic number, because the mean of its divisors is an integer number (106392528).

Almost surely, 2^638244231 is an apocalyptic number.

638244231 is a deficient number, since it is larger than the sum of its proper divisors (212895993).

638244231 is a wasteful number, since it uses less digits than its factorization.

638244231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36981.

The product of its digits is 27648, while the sum is 33.

The square root of 638244231 is about 25263.4960169807. The cubic root of 638244231 is about 860.9850939184.

The spelling of 638244231 in words is "six hundred thirty-eight million, two hundred forty-four thousand, two hundred thirty-one".