47971939 has 2 divisors, whose sum is σ = 47971940. Its totient is φ = 47971938.

The previous prime is 47971901. The next prime is 47971949. The reversal of 47971939 is 93917974.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47971939 - 2⁷ = 47971811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47971892 and 47971901.

It is not a weakly prime, because it can be changed into another prime (47971949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23985969 + 23985970.

It is an arithmetic number, because the mean of its divisors is an integer number (23985970).

Almost surely, 2^47971939 is an apocalyptic number.

47971939 is a deficient number, since it is larger than the sum of its proper divisors (1).

47971939 is an equidigital number, since it uses as much as digits as its factorization.

47971939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 47971939 is about 6926.1778059764. The cubic root of 47971939 is about 363.3532850101.

The spelling of 47971939 in words is "forty-seven million, nine hundred seventy-one thousand, nine hundred thirty-nine".