18713440 has 24 divisors (see below), whose sum is σ = 44210880. Its totient is φ = 7485312.

The previous prime is 18713437. The next prime is 18713449. The reversal of 18713440 is 4431781.

It is a junction number, because it is equal to n+sod(n) for n = 18713399 and 18713408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58320 + ... + 58639.

It is an arithmetic number, because the mean of its divisors is an integer number (1842120).

Almost surely, 2^18713440 is an apocalyptic number.

18713440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18713440 is an abundant number, since it is smaller than the sum of its proper divisors (25497440).

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

18713440 is a wasteful number, since it uses less digits than its factorization.

18713440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116974 (or 116966 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18713440 is about 4325.9033738631. The cubic root of 18713440 is about 265.4918597358.

The spelling of 18713440 in words is "eighteen million, seven hundred thirteen thousand, four hundred forty".