47731387 has 4 divisors (see below), whose sum is σ = 52070616. Its totient is φ = 43392160.

The previous prime is 47731381. The next prime is 47731399. The reversal of 47731387 is 78313774.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47731387 - 2³ = 47731379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47731381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2169598 + ... + 2169619.

It is an arithmetic number, because the mean of its divisors is an integer number (13017654).

Almost surely, 2^47731387 is an apocalyptic number.

47731387 is a deficient number, since it is larger than the sum of its proper divisors (4339229).

47731387 is a wasteful number, since it uses less digits than its factorization.

47731387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4339228.

The product of its digits is 98784, while the sum is 40.

The square root of 47731387 is about 6908.7905598592. The cubic root of 47731387 is about 362.7449303090.

The spelling of 47731387 in words is "forty-seven million, seven hundred thirty-one thousand, three hundred eighty-seven".