18081788 has 12 divisors (see below), whose sum is σ = 31757712. Its totient is φ = 9008160.

The previous prime is 18081781. The next prime is 18081821. The reversal of 18081788 is 88718081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081781) 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, 6920 + ... + 9167.

It is an arithmetic number, because the mean of its divisors is an integer number (2646476).

Almost surely, 2^18081788 is an apocalyptic number.

It is an amenable number.

18081788 is a deficient number, since it is larger than the sum of its proper divisors (13675924).

18081788 is a wasteful number, since it uses less digits than its factorization.

18081788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16372 (or 16370 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 41.

The square root of 18081788 is about 4252.2685710101. The cubic root of 18081788 is about 262.4704752886.

The spelling of 18081788 in words is "eighteen million, eighty-one thousand, seven hundred eighty-eight".