47139999 has 4 divisors (see below), whose sum is σ = 62853336. Its totient is φ = 31426664.

The previous prime is 47139979. The next prime is 47140001. The reversal of 47139999 is 99993174.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47139999 is a prime.

47139999 is a modest number, since divided by 9999 gives 4713 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47139979) 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, 7856664 + ... + 7856669.

It is an arithmetic number, because the mean of its divisors is an integer number (15713334).

Almost surely, 2^47139999 is an apocalyptic number.

47139999 is a deficient number, since it is larger than the sum of its proper divisors (15713337).

47139999 is a wasteful number, since it uses less digits than its factorization.

47139999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15713336.

The product of its digits is 551124, while the sum is 51.

The square root of 47139999 is about 6865.8574846846. The cubic root of 47139999 is about 361.2405734221.

It can be divided in two parts, 471 and 39999, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 47139999 in words is "forty-seven million, one hundred thirty-nine thousand, nine hundred ninety-nine".