19408018 has 24 divisors (see below), whose sum is σ = 35037900. Its totient is φ = 8029728.

The previous prime is 19408003. The next prime is 19408019. The reversal of 19408018 is 81080491.

It can be written as a sum of positive squares in 2 ways, for example, as 19386409 + 21609 = 4403^2 + 147^2 .

It is not an unprimeable number, because it can be changed into a prime (19408019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 573 + ... + 6256.

Almost surely, 2^19408018 is an apocalyptic number.

19408018 is a deficient number, since it is larger than the sum of its proper divisors (15629882).

19408018 is a wasteful number, since it uses less digits than its factorization.

19408018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874 (or 6867 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 19408018 is about 4405.4532116458. The cubic root of 19408018 is about 268.7367508882.

The spelling of 19408018 in words is "nineteen million, four hundred eight thousand, eighteen".