45021989 has 8 divisors (see below), whose sum is σ = 46384800. Its totient is φ = 43673616.

The previous prime is 45021979. The next prime is 45022037. The reversal of 45021989 is 98912054.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45021989 is a prime.

It is a super-2 number, since 2×45021989² = 4053958987032242, 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 (45021919) 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, 2894 + ... + 9920.

It is an arithmetic number, because the mean of its divisors is an integer number (5798100).

Almost surely, 2^45021989 is an apocalyptic number.

It is an amenable number.

45021989 is a deficient number, since it is larger than the sum of its proper divisors (1362811).

45021989 is a wasteful number, since it uses less digits than its factorization.

45021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 45021989 is about 6709.8426956226. The cubic root of 45021989 is about 355.7472562201.

The spelling of 45021989 in words is "forty-five million, twenty-one thousand, nine hundred eighty-nine".