18936890 has 16 divisors (see below), whose sum is σ = 38956032. Its totient is φ = 6492624.

The previous prime is 18936829. The next prime is 18936893. The reversal of 18936890 is 9863981.

It is not an unprimeable number, because it can be changed into a prime (18936893) 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, 135194 + ... + 135333.

It is an arithmetic number, because the mean of its divisors is an integer number (2434752).

Almost surely, 2^18936890 is an apocalyptic number.

18936890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18936890 is an abundant number, since it is smaller than the sum of its proper divisors (20019142).

18936890 is a wasteful number, since it uses less digits than its factorization.

18936890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270541.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18936890 is about 4351.6537086492. The cubic root of 18936890 is about 266.5443935962.

The spelling of 18936890 in words is "eighteen million, nine hundred thirty-six thousand, eight hundred ninety".