45639919 has 8 divisors (see below), whose sum is σ = 51737840. Its totient is φ = 39911616.

The previous prime is 45639911. The next prime is 45639947. The reversal of 45639919 is 91993654.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45639919 - 2³ = 45639911 is a prime.

It is a super-2 number, since 2×45639919² = 4166004412653122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45639911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92142 + ... + 92635.

It is an arithmetic number, because the mean of its divisors is an integer number (6467230).

Almost surely, 2^45639919 is an apocalyptic number.

45639919 is a deficient number, since it is larger than the sum of its proper divisors (6097921).

45639919 is a wasteful number, since it uses less digits than its factorization.

45639919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184809.

The product of its digits is 262440, while the sum is 46.

The square root of 45639919 is about 6755.7323067155. The cubic root of 45639919 is about 357.3674185211.

The spelling of 45639919 in words is "forty-five million, six hundred thirty-nine thousand, nine hundred nineteen".