45187889 has 4 divisors (see below), whose sum is σ = 45226356. Its totient is φ = 45149424.

The previous prime is 45187873. The next prime is 45187907. The reversal of 45187889 is 98878154.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26697889 + 18490000 = 5167^2 + 4300^2 .

It is a cyclic number.

It is not a de Polignac number, because 45187889 - 2⁴ = 45187873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45187189) 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 3 ways as a sum of consecutive naturals, for example, 17414 + ... + 19839.

It is an arithmetic number, because the mean of its divisors is an integer number (11306589).

Almost surely, 2^45187889 is an apocalyptic number.

It is an amenable number.

45187889 is a deficient number, since it is larger than the sum of its proper divisors (38467).

45187889 is a wasteful number, since it uses less digits than its factorization.

45187889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38466.

The product of its digits is 645120, while the sum is 50.

The square root of 45187889 is about 6722.1937639434. The cubic root of 45187889 is about 356.1836809349.

The spelling of 45187889 in words is "forty-five million, one hundred eighty-seven thousand, eight hundred eighty-nine".