47918638 has 4 divisors (see below), whose sum is σ = 71877960. Its totient is φ = 23959318.

The previous prime is 47918623. The next prime is 47918669. The reversal of 47918638 is 83681974.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83681974 = 2 ⋅41840987.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11979658 + ... + 11979661.

It is an arithmetic number, because the mean of its divisors is an integer number (17969490).

Almost surely, 2^47918638 is an apocalyptic number.

47918638 is a deficient number, since it is larger than the sum of its proper divisors (23959322).

47918638 is a wasteful number, since it uses less digits than its factorization.

47918638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23959321.

The product of its digits is 290304, while the sum is 46.

The square root of 47918638 is about 6922.3289433543. The cubic root of 47918638 is about 363.2186627627.

The spelling of 47918638 in words is "forty-seven million, nine hundred eighteen thousand, six hundred thirty-eight".