45904721 has 4 divisors (see below), whose sum is σ = 45941412. Its totient is φ = 45868032.

The previous prime is 45904697. The next prime is 45904739. The reversal of 45904721 is 12740954.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12740954 = 2 ⋅6370477.

It can be written as a sum of positive squares in 2 ways, for example, as 45711121 + 193600 = 6761^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45904721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45904751) 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, 16400 + ... + 18993.

It is an arithmetic number, because the mean of its divisors is an integer number (11485353).

Almost surely, 2^45904721 is an apocalyptic number.

It is an amenable number.

45904721 is a deficient number, since it is larger than the sum of its proper divisors (36691).

45904721 is a wasteful number, since it uses less digits than its factorization.

45904721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36690.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 45904721 is about 6775.3022810794. The cubic root of 45904721 is about 358.0572326130.

The spelling of 45904721 in words is "forty-five million, nine hundred four thousand, seven hundred twenty-one".