45392721 has 16 divisors (see below), whose sum is σ = 66551808. Its totient is φ = 27291600.

The previous prime is 45392707. The next prime is 45392761. The reversal of 45392721 is 12729354.

It is not a de Polignac number, because 45392721 - 2⁶ = 45392657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (45392761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225 + ... + 9606.

It is an arithmetic number, because the mean of its divisors is an integer number (4159488).

Almost surely, 2^45392721 is an apocalyptic number.

It is an amenable number.

45392721 is a deficient number, since it is larger than the sum of its proper divisors (21159087).

45392721 is a wasteful number, since it uses less digits than its factorization.

45392721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its digits is 15120, while the sum is 33.

The square root of 45392721 is about 6737.4120402422. The cubic root of 45392721 is about 356.7210509942.

It can be divided in two parts, 4539 and 2721, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 45392721 in words is "forty-five million, three hundred ninety-two thousand, seven hundred twenty-one".