18101640 has 32 divisors (see below), whose sum is σ = 54305280. Its totient is φ = 4827072.

The previous prime is 18101609. The next prime is 18101647. The reversal of 18101640 is 4610181.

It is not an unprimeable number, because it can be changed into a prime (18101647) 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, 75304 + ... + 75543.

It is an arithmetic number, because the mean of its divisors is an integer number (1697040).

Almost surely, 2^18101640 is an apocalyptic number.

18101640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18101640 is an abundant number, since it is smaller than the sum of its proper divisors (36203640).

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

18101640 is a wasteful number, since it uses less digits than its factorization.

18101640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150861 (or 150857 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18101640 is about 4254.6022140736. The cubic root of 18101640 is about 262.5664956258.

The spelling of 18101640 in words is "eighteen million, one hundred one thousand, six hundred forty".