18345499 has 4 divisors (see below), whose sum is σ = 19424664. Its totient is φ = 17266336.

The previous prime is 18345479. The next prime is 18345517. The reversal of 18345499 is 99454381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99454381 = 13 ⋅7650337.

It is a cyclic number.

It is not a de Polignac number, because 18345499 - 2⁹ = 18344987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18345479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539557 + ... + 539590.

It is an arithmetic number, because the mean of its divisors is an integer number (4856166).

Almost surely, 2^18345499 is an apocalyptic number.

18345499 is a deficient number, since it is larger than the sum of its proper divisors (1079165).

18345499 is a wasteful number, since it uses less digits than its factorization.

18345499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079164.

The product of its digits is 155520, while the sum is 43.

The square root of 18345499 is about 4283.1646010864. The cubic root of 18345499 is about 263.7403084120.

The spelling of 18345499 in words is "eighteen million, three hundred forty-five thousand, four hundred ninety-nine".