47308639 has 4 divisors (see below), whose sum is σ = 54067024. Its totient is φ = 40550256.

The previous prime is 47308627. The next prime is 47308669. The reversal of 47308639 is 93680374.

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

It is a cyclic number.

It is not a de Polignac number, because 47308639 - 2¹³ = 47300447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47308609) 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, 3379182 + ... + 3379195.

It is an arithmetic number, because the mean of its divisors is an integer number (13516756).

Almost surely, 2^47308639 is an apocalyptic number.

47308639 is a deficient number, since it is larger than the sum of its proper divisors (6758385).

47308639 is an equidigital number, since it uses as much as digits as its factorization.

47308639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758384.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 47308639 is about 6878.1275795088. The cubic root of 47308639 is about 361.6708315924.

The spelling of 47308639 in words is "forty-seven million, three hundred eight thousand, six hundred thirty-nine".