18509004 has 36 divisors (see below), whose sum is σ = 47434296. Its totient is φ = 6084288.

The previous prime is 18509003. The next prime is 18509011. The reversal of 18509004 is 40090581.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18509003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 894 + ... + 6149.

Almost surely, 2^18509004 is an apocalyptic number.

It is an amenable number.

18509004 is an abundant number, since it is smaller than the sum of its proper divisors (28925292).

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

18509004 is a wasteful number, since it uses less digits than its factorization.

18509004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126 (or 7121 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18509004 is about 4302.2091999344. The cubic root of 18509004 is about 264.5215241625.

Adding to 18509004 its reverse (40090581), we get a palindrome (58599585).

The spelling of 18509004 in words is "eighteen million, five hundred nine thousand, four".