45381989 has 4 divisors (see below), whose sum is σ = 45410400. Its totient is φ = 45353580.

The previous prime is 45381979. The next prime is 45381997. The reversal of 45381989 is 98918354.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45381989 - 2²⁴ = 28604773 is a prime.

It is a super-2 number, since 2×45381989² = 4119049851192242, 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 (45381929) 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, 11657 + ... + 15054.

It is an arithmetic number, because the mean of its divisors is an integer number (11352600).

Almost surely, 2^45381989 is an apocalyptic number.

It is an amenable number.

45381989 is a deficient number, since it is larger than the sum of its proper divisors (28411).

45381989 is a wasteful number, since it uses less digits than its factorization.

45381989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28410.

The product of its digits is 311040, while the sum is 47.

The square root of 45381989 is about 6736.6155449157. The cubic root of 45381989 is about 356.6929361189.

The spelling of 45381989 in words is "forty-five million, three hundred eighty-one thousand, nine hundred eighty-nine".