18540299 has 4 divisors (see below), whose sum is σ = 18681960. Its totient is φ = 18398640.

The previous prime is 18540259. The next prime is 18540311. The reversal of 18540299 is 99204581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18540299 - 2¹⁶ = 18474763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18540209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70634 + ... + 70895.

It is an arithmetic number, because the mean of its divisors is an integer number (4670490).

Almost surely, 2^18540299 is an apocalyptic number.

18540299 is a deficient number, since it is larger than the sum of its proper divisors (141661).

18540299 is a wasteful number, since it uses less digits than its factorization.

18540299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141660.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 18540299 is about 4305.8447487108. The cubic root of 18540299 is about 264.6705244344.

The spelling of 18540299 in words is "eighteen million, five hundred forty thousand, two hundred ninety-nine".