45138939 has 4 divisors (see below), whose sum is σ = 60185256. Its totient is φ = 30092624.

The previous prime is 45138937. The next prime is 45138943. The reversal of 45138939 is 93983154.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 45138939 - 2¹ = 45138937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45138939.

It is not an unprimeable number, because it can be changed into a prime (45138937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7523154 + ... + 7523159.

It is an arithmetic number, because the mean of its divisors is an integer number (15046314).

Almost surely, 2^45138939 is an apocalyptic number.

45138939 is a deficient number, since it is larger than the sum of its proper divisors (15046317).

45138939 is a wasteful number, since it uses less digits than its factorization.

45138939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15046316.

The product of its digits is 116640, while the sum is 42.

The square root of 45138939 is about 6718.5518528921. The cubic root of 45138939 is about 356.0550219000.

The spelling of 45138939 in words is "forty-five million, one hundred thirty-eight thousand, nine hundred thirty-nine".