27972418 has 4 divisors (see below), whose sum is σ = 41958630. Its totient is φ = 13986208.

The previous prime is 27972401. The next prime is 27972421. The reversal of 27972418 is 81427972.

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., 24235929 + 3736489 = 4923^2 + 1933^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993103 + ... + 6993106.

Almost surely, 2^27972418 is an apocalyptic number.

27972418 is a deficient number, since it is larger than the sum of its proper divisors (13986212).

27972418 is a wasteful number, since it uses less digits than its factorization.

27972418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13986211.

The product of its digits is 56448, while the sum is 40.

The square root of 27972418 is about 5288.8957259526. The cubic root of 27972418 is about 303.5591558617.

The spelling of 27972418 in words is "twenty-seven million, nine hundred seventy-two thousand, four hundred eighteen".