18699490 has 32 divisors (see below), whose sum is σ = 36877680. Its totient is φ = 6795264.

The previous prime is 18699487. The next prime is 18699511. The reversal of 18699490 is 9499681.

It can be written as a sum of positive squares in 8 ways, for example, as 7789681 + 10909809 = 2791^2 + 3303^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18699490.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3034 + ... + 6826.

Almost surely, 2^18699490 is an apocalyptic number.

18699490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18699490 is a deficient number, since it is larger than the sum of its proper divisors (18178190).

18699490 is a wasteful number, since it uses less digits than its factorization.

18699490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 18699490 is about 4324.2906932814. The cubic root of 18699490 is about 265.4258727212.

The spelling of 18699490 in words is "eighteen million, six hundred ninety-nine thousand, four hundred ninety".