18038780 has 24 divisors (see below), whose sum is σ = 37987152. Its totient is φ = 7195392.

The previous prime is 18038777. The next prime is 18038789. The reversal of 18038780 is 8783081.

It is a self number, because there is not a number n which added to its sum of digits gives 18038780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038789) 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, 7619 + ... + 9701.

It is an arithmetic number, because the mean of its divisors is an integer number (1582798).

Almost surely, 2^18038780 is an apocalyptic number.

18038780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18038780 is an abundant number, since it is smaller than the sum of its proper divisors (19948372).

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

18038780 is a wasteful number, since it uses less digits than its factorization.

18038780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 18038780 is about 4247.2084950000. The cubic root of 18038780 is about 262.2622124791.

The spelling of 18038780 in words is "eighteen million, thirty-eight thousand, seven hundred eighty".