18899290 has 16 divisors (see below), whose sum is σ = 34071912. Its totient is φ = 7547904.

The previous prime is 18899273. The next prime is 18899299. The reversal of 18899290 is 9299881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13741849 + 5157441 = 3707^2 + 2271^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18899290.

It is not an unprimeable number, because it can be changed into a prime (18899299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8362 + ... + 10378.

Almost surely, 2^18899290 is an apocalyptic number.

18899290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18899290 is a deficient number, since it is larger than the sum of its proper divisors (15172622).

18899290 is a wasteful number, since it uses less digits than its factorization.

18899290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 18899290 is about 4347.3313653321. The cubic root of 18899290 is about 266.3678649686.

The spelling of 18899290 in words is "eighteen million, eight hundred ninety-nine thousand, two hundred ninety".