18725890 has 8 divisors (see below), whose sum is σ = 33706620. Its totient is φ = 7490352.

The previous prime is 18725821. The next prime is 18725893. The reversal of 18725890 is 9852781.

It can be written as a sum of positive squares in 2 ways, for example, as 18636489 + 89401 = 4317^2 + 299^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18725893) 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 3 ways as a sum of consecutive naturals, for example, 936285 + ... + 936304.

Almost surely, 2^18725890 is an apocalyptic number.

18725890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18725890 is a deficient number, since it is larger than the sum of its proper divisors (14980730).

18725890 is a wasteful number, since it uses less digits than its factorization.

18725890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872596.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 18725890 is about 4327.3421403906. The cubic root of 18725890 is about 265.5507236843.

The spelling of 18725890 in words is "eighteen million, seven hundred twenty-five thousand, eight hundred ninety".