16722418 has 16 divisors (see below), whose sum is σ = 25741656. Its totient is φ = 8144640.

The previous prime is 16722397. The next prime is 16722427. The reversal of 16722418 is 81422761.

It can be written as a sum of positive squares in 4 ways, for example, as 1096209 + 15626209 = 1047^2 + 3953^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16722418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13180 + ... + 14392.

Almost surely, 2^16722418 is an apocalyptic number.

16722418 is a deficient number, since it is larger than the sum of its proper divisors (9019238).

16722418 is a wasteful number, since it uses less digits than its factorization.

16722418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389.

The product of its digits is 5376, while the sum is 31.

The square root of 16722418 is about 4089.3053199780. The cubic root of 16722418 is about 255.7209789572.

The spelling of 16722418 in words is "sixteen million, seven hundred twenty-two thousand, four hundred eighteen".