18049590 has 48 divisors (see below), whose sum is σ = 50542128. Its totient is φ = 4442688.

The previous prime is 18049583. The next prime is 18049607. The reversal of 18049590 is 9594081.

18049590 is a `hidden beast` number, since 1 + 80 + 495 + 90 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6544 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (1052961).

Almost surely, 2^18049590 is an apocalyptic number.

18049590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18049590 is an abundant number, since it is smaller than the sum of its proper divisors (32492538).

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

18049590 is a wasteful number, since it uses less digits than its factorization.

18049590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15453 (or 15450 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18049590 is about 4248.4809049824. The cubic root of 18049590 is about 262.3145901600.

It can be divided in two parts, 180 and 49590, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 18049590 in words is "eighteen million, forty-nine thousand, five hundred ninety".