45405639 has 6 divisors (see below), whose sum is σ = 65585936. Its totient is φ = 30270420.

The previous prime is 45405637. The next prime is 45405643. The reversal of 45405639 is 93650454.

It is a happy number.

It is not a de Polignac number, because 45405639 - 2¹ = 45405637 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 (45405637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2522527 + ... + 2522544.

Almost surely, 2^45405639 is an apocalyptic number.

45405639 is a deficient number, since it is larger than the sum of its proper divisors (20180297).

45405639 is a wasteful number, since it uses less digits than its factorization.

45405639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045077 (or 5045074 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 45405639 is about 6738.3706487548. The cubic root of 45405639 is about 356.7548867089.

The spelling of 45405639 in words is "forty-five million, four hundred five thousand, six hundred thirty-nine".