47972018 has 4 divisors (see below), whose sum is σ = 71958030. Its totient is φ = 23986008.

The previous prime is 47971999. The next prime is 47972033. The reversal of 47972018 is 81027974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81027974 = 2 ⋅40513987.

It can be written as a sum of positive squares in only one way, i.e., 44448889 + 3523129 = 6667^2 + 1877^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11993003 + ... + 11993006.

Almost surely, 2^47972018 is an apocalyptic number.

47972018 is a deficient number, since it is larger than the sum of its proper divisors (23986012).

47972018 is a wasteful number, since it uses less digits than its factorization.

47972018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23986011.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 47972018 is about 6926.1835089752. The cubic root of 47972018 is about 363.3534844663.

The spelling of 47972018 in words is "forty-seven million, nine hundred seventy-two thousand, eighteen".