13831940 has 24 divisors (see below), whose sum is σ = 29597400. Its totient is φ = 5427968.

The previous prime is 13831919. The next prime is 13831957. The reversal of 13831940 is 4913831.

It can be written as a sum of positive squares in 4 ways, for example, as 2849344 + 10982596 = 1688^2 + 3314^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5465 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (1233225).

Almost surely, 2^13831940 is an apocalyptic number.

13831940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13831940 is an abundant number, since it is smaller than the sum of its proper divisors (15765460).

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

13831940 is a wasteful number, since it uses less digits than its factorization.

13831940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13111 (or 13109 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 13831940 is about 3719.1316190745. The cubic root of 13831940 is about 240.0459402797.

The spelling of 13831940 in words is "thirteen million, eight hundred thirty-one thousand, nine hundred forty".