18281740 has 24 divisors (see below), whose sum is σ = 39044880. Its totient is φ = 7188288.

The previous prime is 18281729. The next prime is 18281741. The reversal of 18281740 is 4718281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18281741) 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, 6567 + ... + 8926.

It is an arithmetic number, because the mean of its divisors is an integer number (1626870).

Almost surely, 2^18281740 is an apocalyptic number.

18281740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18281740 is an abundant number, since it is smaller than the sum of its proper divisors (20763140).

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

18281740 is a wasteful number, since it uses less digits than its factorization.

18281740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15561 (or 15559 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18281740 is about 4275.7151448617. The cubic root of 18281740 is about 263.4344143630.

The spelling of 18281740 in words is "eighteen million, two hundred eighty-one thousand, seven hundred forty".