18923408 has 30 divisors (see below), whose sum is σ = 42651846. Its totient is φ = 8109696.

The previous prime is 18923407. The next prime is 18923441. The reversal of 18923408 is 80432981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 1517824 = 4172^2 + 1232^2 .

It is not an unprimeable number, because it can be changed into a prime (18923407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11285 + ... + 12852.

Almost surely, 2^18923408 is an apocalyptic number.

It is an amenable number.

18923408 is an abundant number, since it is smaller than the sum of its proper divisors (23728438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18923408 is a wasteful number, since it uses less digits than its factorization.

18923408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24159 (or 24146 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18923408 is about 4350.1043665641. The cubic root of 18923408 is about 266.4811237095.

The spelling of 18923408 in words is "eighteen million, nine hundred twenty-three thousand, four hundred eight".