18440099 has 4 divisors (see below), whose sum is σ = 18542160. Its totient is φ = 18338040.

The previous prime is 18440047. The next prime is 18440111. The reversal of 18440099 is 99004481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99004481 = 17 ⋅5823793.

It is a cyclic number.

It is not a de Polignac number, because 18440099 - 2¹² = 18436003 is a prime.

It is a super-2 number, since 2×18440099² = 680074502259602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18440029) 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, 50759 + ... + 51120.

It is an arithmetic number, because the mean of its divisors is an integer number (4635540).

Almost surely, 2^18440099 is an apocalyptic number.

18440099 is a deficient number, since it is larger than the sum of its proper divisors (102061).

18440099 is a wasteful number, since it uses less digits than its factorization.

18440099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102060.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18440099 is about 4294.1936379255. The cubic root of 18440099 is about 264.1928639291.

The spelling of 18440099 in words is "eighteen million, four hundred forty thousand, ninety-nine".