18047399 has 8 divisors (see below), whose sum is σ = 18451200. Its totient is φ = 17647200.

The previous prime is 18047383. The next prime is 18047411. The reversal of 18047399 is 99374081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18047399 - 2⁴ = 18047383 is a prime.

It is a super-2 number, since 2×18047399² = 651417221330402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18047299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10877 + ... + 12425.

It is an arithmetic number, because the mean of its divisors is an integer number (2306400).

Almost surely, 2^18047399 is an apocalyptic number.

18047399 is a deficient number, since it is larger than the sum of its proper divisors (403801).

18047399 is a wasteful number, since it uses less digits than its factorization.

18047399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18047399 is about 4248.2230402840. The cubic root of 18047399 is about 262.3039758003.

The spelling of 18047399 in words is "eighteen million, forty-seven thousand, three hundred ninety-nine".