13881240 has 64 divisors (see below), whose sum is σ = 46274400. Its totient is φ = 3701376.

The previous prime is 13881239. The next prime is 13881269. The reversal of 13881240 is 4218831.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5347 + ... + 7506.

Almost surely, 2^13881240 is an apocalyptic number.

13881240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13881240 is an abundant number, since it is smaller than the sum of its proper divisors (32393160).

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

13881240 is a wasteful number, since it uses less digits than its factorization.

13881240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12873 (or 12863 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 13881240 is about 3725.7536150422. The cubic root of 13881240 is about 240.3307938548.

It can be divided in two parts, 1388 and 1240, that added together give a triangular number (2628 = T₇₂).

The spelling of 13881240 in words is "thirteen million, eight hundred eighty-one thousand, two hundred forty".