18090906 has 16 divisors (see below), whose sum is σ = 36334848. Its totient is φ = 6004800.

The previous prime is 18090901. The next prime is 18090923. The reversal of 18090906 is 60909081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18090901) 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, 4810 + ... + 7701.

It is an arithmetic number, because the mean of its divisors is an integer number (2270928).

Almost surely, 2^18090906 is an apocalyptic number.

18090906 is an abundant number, since it is smaller than the sum of its proper divisors (18243942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18090906 is a wasteful number, since it uses less digits than its factorization.

18090906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12757.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 18090906 is about 4253.3405694818. The cubic root of 18090906 is about 262.5145860376.

Adding to 18090906 its reverse (60909081), we get a palindrome (78999987).

The spelling of 18090906 in words is "eighteen million, ninety thousand, nine hundred six".