18713890 has 16 divisors (see below), whose sum is σ = 36276408. Its totient is φ = 6909696.

The previous prime is 18713869. The next prime is 18713899. The reversal of 18713890 is 9831781.

It can be written as a sum of positive squares in 4 ways, for example, as 5890329 + 12823561 = 2427^2 + 3581^2 .

It is not an unprimeable number, because it can be changed into a prime (18713899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71847 + ... + 72106.

Almost surely, 2^18713890 is an apocalyptic number.

18713890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18713890 is a deficient number, since it is larger than the sum of its proper divisors (17562518).

18713890 is a wasteful number, since it uses less digits than its factorization.

18713890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143973.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18713890 is about 4325.9553858079. The cubic root of 18713890 is about 265.4939878031.

The spelling of 18713890 in words is "eighteen million, seven hundred thirteen thousand, eight hundred ninety".