18168907 has 4 divisors (see below), whose sum is σ = 18197056. Its totient is φ = 18140760.

The previous prime is 18168901. The next prime is 18168923. The reversal of 18168907 is 70986181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70986181 = 7 ⋅10140883.

It is a cyclic number.

It is not a de Polignac number, because 18168907 - 2¹⁹ = 17644619 is a prime.

It is the 4263-rd Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18168907.

It is not an unprimeable number, because it can be changed into a prime (18168901) by changing a digit.

It is a nontrivial repunit in base 4262.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13083 + ... + 14404.

It is an arithmetic number, because the mean of its divisors is an integer number (4549264).

Almost surely, 2^18168907 is an apocalyptic number.

18168907 is a deficient number, since it is larger than the sum of its proper divisors (28149).

18168907 is an equidigital number, since it uses as much as digits as its factorization.

18168907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28148.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18168907 is about 4262.5000879765. The cubic root of 18168907 is about 262.8913322646.

The spelling of 18168907 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred seven".