47128939 has 16 divisors (see below), whose sum is σ = 56206080. Its totient is φ = 38950560.

The previous prime is 47128919. The next prime is 47128943. The reversal of 47128939 is 93982174.

It is not a de Polignac number, because 47128939 - 2¹⁹ = 46604651 is a prime.

It is a super-2 number, since 2×47128939² = 4442273782531442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47128895 and 47128904.

It is not an unprimeable number, because it can be changed into a prime (47128919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7122 + ... + 12040.

It is an arithmetic number, because the mean of its divisors is an integer number (3512880).

Almost surely, 2^47128939 is an apocalyptic number.

47128939 is a deficient number, since it is larger than the sum of its proper divisors (9077141).

47128939 is a wasteful number, since it uses less digits than its factorization.

47128939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its digits is 108864, while the sum is 43.

The square root of 47128939 is about 6865.0520027164. The cubic root of 47128939 is about 361.2123197569.

The spelling of 47128939 in words is "forty-seven million, one hundred twenty-eight thousand, nine hundred thirty-nine".