45171972 has 24 divisors (see below), whose sum is σ = 117112800. Its totient is φ = 15057288.

The previous prime is 45171967. The next prime is 45171979. The reversal of 45171972 is 27917154.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (45171979) 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, 209022 + ... + 209237.

It is an arithmetic number, because the mean of its divisors is an integer number (4879700).

Almost surely, 2^45171972 is an apocalyptic number.

It is an amenable number.

45171972 is an abundant number, since it is smaller than the sum of its proper divisors (71940828).

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

45171972 is a wasteful number, since it uses less digits than its factorization.

45171972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418272 (or 418264 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 45171972 is about 6721.0097455665. The cubic root of 45171972 is about 356.1418552631.

The spelling of 45171972 in words is "forty-five million, one hundred seventy-one thousand, nine hundred seventy-two".