18540550 has 24 divisors (see below), whose sum is σ = 39412656. Its totient is φ = 6356640.

The previous prime is 18540539. The next prime is 18540581. The reversal of 18540550 is 5504581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26137 + ... + 26836.

It is an arithmetic number, because the mean of its divisors is an integer number (1642194).

Almost surely, 2^18540550 is an apocalyptic number.

18540550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18540550 is an abundant number, since it is smaller than the sum of its proper divisors (20872106).

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

18540550 is a wasteful number, since it uses less digits than its factorization.

18540550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52992 (or 52987 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 18540550 is about 4305.8738950415. The cubic root of 18540550 is about 264.6717188057.

The spelling of 18540550 in words is "eighteen million, five hundred forty thousand, five hundred fifty".