47912139 has 24 divisors (see below), whose sum is σ = 76220352. Its totient is φ = 28759920.

The previous prime is 47912131. The next prime is 47912141. The reversal of 47912139 is 93121974.

It is not a de Polignac number, because 47912139 - 2³ = 47912131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47912131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8332 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (3175848).

Almost surely, 2^47912139 is an apocalyptic number.

47912139 is a deficient number, since it is larger than the sum of its proper divisors (28308213).

47912139 is a wasteful number, since it uses less digits than its factorization.

47912139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647 (or 4644 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 47912139 is about 6921.8595044973. The cubic root of 47912139 is about 363.2022414222.

The spelling of 47912139 in words is "forty-seven million, nine hundred twelve thousand, one hundred thirty-nine".