18406799 has 4 divisors (see below), whose sum is σ = 18467064. Its totient is φ = 18346536.

The previous prime is 18406789. The next prime is 18406807. The reversal of 18406799 is 99760481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99760481 = 6163 ⋅16187.

It is a cyclic number.

It is not a de Polignac number, because 18406799 - 2⁴ = 18406783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406769) 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, 29672 + ... + 30285.

It is an arithmetic number, because the mean of its divisors is an integer number (4616766).

Almost surely, 2^18406799 is an apocalyptic number.

18406799 is a deficient number, since it is larger than the sum of its proper divisors (60265).

18406799 is an equidigital number, since it uses as much as digits as its factorization.

18406799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60264.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 18406799 is about 4290.3145572324. The cubic root of 18406799 is about 264.0337374622.

The spelling of 18406799 in words is "eighteen million, four hundred six thousand, seven hundred ninety-nine".