247421872 has 10 divisors (see below), whose sum is σ = 479379908. Its totient is φ = 123710928.

The previous prime is 247421851. The next prime is 247421873. The reversal of 247421872 is 278124742.

It is a super-2 number, since 2×247421872² = 122435165487968768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247421873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7731918 + ... + 7731949.

Almost surely, 2^247421872 is an apocalyptic number.

It is an amenable number.

247421872 is a deficient number, since it is larger than the sum of its proper divisors (231958036).

247421872 is a wasteful number, since it uses less digits than its factorization.

247421872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15463875 (or 15463869 counting only the distinct ones).

The product of its digits is 50176, while the sum is 37.

The square root of 247421872 is about 15729.6494557253. The cubic root of 247421872 is about 627.7875462935.

The spelling of 247421872 in words is "two hundred forty-seven million, four hundred twenty-one thousand, eight hundred seventy-two".