45239939 has 2 divisors, whose sum is σ = 45239940. Its totient is φ = 45239938.

The previous prime is 45239911. The next prime is 45239951. The reversal of 45239939 is 93993254.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45239939 - 2²⁰ = 44191363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45239939.

It is not a weakly prime, because it can be changed into another prime (45239959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22619969 + 22619970.

It is an arithmetic number, because the mean of its divisors is an integer number (22619970).

Almost surely, 2^45239939 is an apocalyptic number.

45239939 is a deficient number, since it is larger than the sum of its proper divisors (1).

45239939 is an equidigital number, since it uses as much as digits as its factorization.

45239939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 44.

The square root of 45239939 is about 6726.0641537232. The cubic root of 45239939 is about 356.3203860515.

The spelling of 45239939 in words is "forty-five million, two hundred thirty-nine thousand, nine hundred thirty-nine".