45138919 has 8 divisors (see below), whose sum is σ = 51690528. Its totient is φ = 38613120.

The previous prime is 45138917. The next prime is 45138923. The reversal of 45138919 is 91983154.

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

It is not a de Polignac number, because 45138919 - 2¹ = 45138917 is a prime.

It is a super-2 number, since 2×45138919² = 4075044016977122, 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 (45138911) 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, 2542 + ... + 9835.

It is an arithmetic number, because the mean of its divisors is an integer number (6461316).

Almost surely, 2^45138919 is an apocalyptic number.

45138919 is a deficient number, since it is larger than the sum of its proper divisors (6551609).

45138919 is a wasteful number, since it uses less digits than its factorization.

45138919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12905.

The product of its digits is 38880, while the sum is 40.

The square root of 45138919 is about 6718.5503644760. The cubic root of 45138919 is about 356.0549693135.

The spelling of 45138919 in words is "forty-five million, one hundred thirty-eight thousand, nine hundred nineteen".