45138723 has 32 divisors (see below), whose sum is σ = 73281024. Its totient is φ = 24125952.

The previous prime is 45138713. The next prime is 45138727. The reversal of 45138723 is 32783154.

It is not a de Polignac number, because 45138723 - 2⁴ = 45138707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45138727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80761 + ... + 81317.

It is an arithmetic number, because the mean of its divisors is an integer number (2290032).

Almost surely, 2^45138723 is an apocalyptic number.

45138723 is a deficient number, since it is larger than the sum of its proper divisors (28142301).

45138723 is a wasteful number, since it uses less digits than its factorization.

45138723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its digits is 20160, while the sum is 33.

The square root of 45138723 is about 6718.5357779802. The cubic root of 45138723 is about 356.0544539646.

The spelling of 45138723 in words is "forty-five million, one hundred thirty-eight thousand, seven hundred twenty-three".