18806290 has 16 divisors (see below), whose sum is σ = 34677720. Its totient is φ = 7338880.

The previous prime is 18806261. The next prime is 18806303. The reversal of 18806290 is 9260881.

It can be written as a sum of positive squares in 4 ways, for example, as 11978521 + 6827769 = 3461^2 + 2613^2 .

It is a super-3 number, since 3×18806290³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22525 + ... + 23344.

Almost surely, 2^18806290 is an apocalyptic number.

18806290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18806290 is a deficient number, since it is larger than the sum of its proper divisors (15871430).

18806290 is a wasteful number, since it uses less digits than its factorization.

18806290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45917.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18806290 is about 4336.6219572381. The cubic root of 18806290 is about 265.9302302553.

The spelling of 18806290 in words is "eighteen million, eight hundred six thousand, two hundred ninety".