18061904 has 20 divisors (see below), whose sum is σ = 39994464. Its totient is φ = 7740768.

The previous prime is 18061891. The next prime is 18061907. The reversal of 18061904 is 40916081.

18061904 = 165² + 166² + ... + 388².

It is a super-2 number, since 2×18061904² = 652464752210432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061907) 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, 80522 + ... + 80745.

Almost surely, 2^18061904 is an apocalyptic number.

18061904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18061904 is an abundant number, since it is smaller than the sum of its proper divisors (21932560).

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

18061904 is a wasteful number, since it uses less digits than its factorization.

18061904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161282 (or 161276 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18061904 is about 4249.9298817745. The cubic root of 18061904 is about 262.3742296970.

Adding to 18061904 its reverse (40916081), we get a palindrome (58977985).

The spelling of 18061904 in words is "eighteen million, sixty-one thousand, nine hundred four".