47639639 has 2 divisors, whose sum is σ = 47639640. Its totient is φ = 47639638.

The previous prime is 47639629. The next prime is 47639681. The reversal of 47639639 is 93693674.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47639639 - 2¹⁶ = 47574103 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 47639593 and 47639602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47639629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23819819 + 23819820.

It is an arithmetic number, because the mean of its divisors is an integer number (23819820).

Almost surely, 2^47639639 is an apocalyptic number.

47639639 is a deficient number, since it is larger than the sum of its proper divisors (1).

47639639 is an equidigital number, since it uses as much as digits as its factorization.

47639639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 47.

The square root of 47639639 is about 6902.1474194630. The cubic root of 47639639 is about 362.5123616870.

The spelling of 47639639 in words is "forty-seven million, six hundred thirty-nine thousand, six hundred thirty-nine".