18162890 has 32 divisors (see below), whose sum is σ = 33626880. Its totient is φ = 7061184.

The previous prime is 18162889. The next prime is 18162901. The reversal of 18162890 is 9826181.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18162890.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65432 + ... + 65708.

It is an arithmetic number, because the mean of its divisors is an integer number (1050840).

Almost surely, 2^18162890 is an apocalyptic number.

18162890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18162890 is a deficient number, since it is larger than the sum of its proper divisors (15463990).

18162890 is a wasteful number, since it uses less digits than its factorization.

18162890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18162890 is about 4261.7942230943. The cubic root of 18162890 is about 262.8623084715.

The spelling of 18162890 in words is "eighteen million, one hundred sixty-two thousand, eight hundred ninety".