18253890 has 32 divisors (see below), whose sum is σ = 48677760. Its totient is φ = 4867632.

The previous prime is 18253877. The next prime is 18253891. The reversal of 18253890 is 9835281.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18253891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33534 + ... + 34073.

It is an arithmetic number, because the mean of its divisors is an integer number (1521180).

Almost surely, 2^18253890 is an apocalyptic number.

18253890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18253890 is an abundant number, since it is smaller than the sum of its proper divisors (30423870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18253890 is a wasteful number, since it uses less digits than its factorization.

18253890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67623 (or 67617 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18253890 is about 4272.4571384626. The cubic root of 18253890 is about 263.3005763167.

The spelling of 18253890 in words is "eighteen million, two hundred fifty-three thousand, eight hundred ninety".