18899690 has 8 divisors (see below), whose sum is σ = 34019460. Its totient is φ = 7559872.

The previous prime is 18899663. The next prime is 18899693. The reversal of 18899690 is 9699881.

It can be written as a sum of positive squares in 2 ways, for example, as 18757561 + 142129 = 4331^2 + 377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18899690² = 714396564192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18899693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944975 + ... + 944994.

Almost surely, 2^18899690 is an apocalyptic number.

18899690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18899690 is a deficient number, since it is larger than the sum of its proper divisors (15119770).

18899690 is a wasteful number, since it uses less digits than its factorization.

18899690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889976.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 18899690 is about 4347.3773703234. The cubic root of 18899690 is about 266.3697441643.

The spelling of 18899690 in words is "eighteen million, eight hundred ninety-nine thousand, six hundred ninety".