18125890 has 8 divisors (see below), whose sum is σ = 32626620. Its totient is φ = 7250352.

The previous prime is 18125857. The next prime is 18125897. The reversal of 18125890 is 9852181.

It can be written as a sum of positive squares in 2 ways, for example, as 15657849 + 2468041 = 3957^2 + 1571^2 .

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 (18125897) 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, 906285 + ... + 906304.

Almost surely, 2^18125890 is an apocalyptic number.

18125890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18125890 is a deficient number, since it is larger than the sum of its proper divisors (14500730).

18125890 is a wasteful number, since it uses less digits than its factorization.

18125890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812596.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 18125890 is about 4257.4511153976. The cubic root of 18125890 is about 262.6836930423.

The spelling of 18125890 in words is "eighteen million, one hundred twenty-five thousand, eight hundred ninety".