247972638 has 32 divisors (see below), whose sum is σ = 500860800. Its totient is φ = 81842976.

The previous prime is 247972619. The next prime is 247972657. The reversal of 247972638 is 836279742.

It is an interprime number because it is at equal distance from previous prime (247972619) and next prime (247972657).

It is a super-2 number, since 2×247972638² = 122980858393358088, which contains 22 as substring.

Its product of digits (1016064) is a multiple of the sum of its prime divisors (1176).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400293 + ... + 400911.

It is an arithmetic number, because the mean of its divisors is an integer number (15651900).

Almost surely, 2^247972638 is an apocalyptic number.

247972638 is an abundant number, since it is smaller than the sum of its proper divisors (252888162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247972638 is a wasteful number, since it uses less digits than its factorization.

247972638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its digits is 1016064, while the sum is 48.

The square root of 247972638 is about 15747.1469796913. The cubic root of 247972638 is about 628.2530235915.

The spelling of 247972638 in words is "two hundred forty-seven million, nine hundred seventy-two thousand, six hundred thirty-eight".