45042138 has 12 divisors (see below), whose sum is σ = 97591338. Its totient is φ = 15014040.

The previous prime is 45042131. The next prime is 45042203. The reversal of 45042138 is 83124054.

It can be written as a sum of positive squares in only one way, i.e., 31843449 + 13198689 = 5643^2 + 3633^2 .

It is a super-2 number, since 2×45042138² = 4057588391222088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45042131) 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, 1251153 + ... + 1251188.

Almost surely, 2^45042138 is an apocalyptic number.

45042138 is an abundant number, since it is smaller than the sum of its proper divisors (52549200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

45042138 is a wasteful number, since it uses less digits than its factorization.

45042138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502349 (or 2502346 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 45042138 is about 6711.3439786678. The cubic root of 45042138 is about 355.8003183095.

The spelling of 45042138 in words is "forty-five million, forty-two thousand, one hundred thirty-eight".