13900240 has 40 divisors (see below), whose sum is σ = 32497920. Its totient is φ = 5529216.

The previous prime is 13900231. The next prime is 13900247. The reversal of 13900240 is 4200931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13900247) 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, 18757 + ... + 19483.

It is an arithmetic number, because the mean of its divisors is an integer number (812448).

Almost surely, 2^13900240 is an apocalyptic number.

13900240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13900240 is an abundant number, since it is smaller than the sum of its proper divisors (18597680).

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

13900240 is a wasteful number, since it uses less digits than its factorization.

13900240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 13900240 is about 3728.3025628294. The cubic root of 13900240 is about 240.4403950934.

The spelling of 13900240 in words is "thirteen million, nine hundred thousand, two hundred forty".