23218906 has 16 divisors (see below), whose sum is σ = 37875816. Its totient is φ = 10630656.

The previous prime is 23218883. The next prime is 23218913. The reversal of 23218906 is 60981232.

It can be written as a sum of positive squares in 4 ways, for example, as 22953681 + 265225 = 4791^2 + 515^2 .

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, 7971 + ... + 10486.

Almost surely, 2^23218906 is an apocalyptic number.

23218906 is a deficient number, since it is larger than the sum of its proper divisors (14656910).

23218906 is a wasteful number, since it uses less digits than its factorization.

23218906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18513.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 23218906 is about 4818.6000041506. The cubic root of 23218906 is about 285.2860818753.

The spelling of 23218906 in words is "twenty-three million, two hundred eighteen thousand, nine hundred six".