18358906 has 4 divisors (see below), whose sum is σ = 27538362. Its totient is φ = 9179452.

The previous prime is 18358903. The next prime is 18358909. The reversal of 18358906 is 60985381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18358903) and next prime (18358909).

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 1343281 = 4125^2 + 1159^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18358903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4589725 + ... + 4589728.

Almost surely, 2^18358906 is an apocalyptic number.

18358906 is a deficient number, since it is larger than the sum of its proper divisors (9179456).

18358906 is an equidigital number, since it uses as much as digits as its factorization.

18358906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179455.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18358906 is about 4284.7293963563. The cubic root of 18358906 is about 263.8045404306.

The spelling of 18358906 in words is "eighteen million, three hundred fifty-eight thousand, nine hundred six".