416172721 has 4 divisors (see below), whose sum is σ = 419349744. Its totient is φ = 412995700.

The previous prime is 416172703. The next prime is 416172727. The reversal of 416172721 is 127271614.

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 416172721 - 2⁷ = 416172593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (416172727) 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, 1588315 + ... + 1588576.

It is an arithmetic number, because the mean of its divisors is an integer number (104837436).

Almost surely, 2^416172721 is an apocalyptic number.

It is an amenable number.

416172721 is a deficient number, since it is larger than the sum of its proper divisors (3177023).

416172721 is a wasteful number, since it uses less digits than its factorization.

416172721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3177022.

The product of its digits is 4704, while the sum is 31.

The square root of 416172721 is about 20400.3117868331. The cubic root of 416172721 is about 746.6055316611.

The spelling of 416172721 in words is "four hundred sixteen million, one hundred seventy-two thousand, seven hundred twenty-one".