18145550 has 12 divisors (see below), whose sum is σ = 33750816. Its totient is φ = 7258200.

The previous prime is 18145529. The next prime is 18145637. The reversal of 18145550 is 5554181.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181406 + ... + 181505.

It is an arithmetic number, because the mean of its divisors is an integer number (2812568).

Almost surely, 2^18145550 is an apocalyptic number.

18145550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18145550 is a deficient number, since it is larger than the sum of its proper divisors (15605266).

18145550 is a wasteful number, since it uses less digits than its factorization.

18145550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362923 (or 362918 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

The square root of 18145550 is about 4259.7593828760. The cubic root of 18145550 is about 262.7786308242.

The spelling of 18145550 in words is "eighteen million, one hundred forty-five thousand, five hundred fifty".