13911940 has 24 divisors (see below), whose sum is σ = 33388992. Its totient is φ = 4769760.

The previous prime is 13911929. The next prime is 13911949. The reversal of 13911940 is 4911931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 13911899 and 13911908.

It is not an unprimeable number, because it can be changed into a prime (13911949) 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, 49546 + ... + 49825.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^13911940 is an apocalyptic number.

13911940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13911940 is an abundant number, since it is smaller than the sum of its proper divisors (19477052).

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

13911940 is a wasteful number, since it uses less digits than its factorization.

13911940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99387 (or 99385 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 13911940 is about 3729.8713114530. The cubic root of 13911940 is about 240.5078367036.

Subtracting from 13911940 its reverse (4911931), we obtain a palindrome (9000009).

The spelling of 13911940 in words is "thirteen million, nine hundred eleven thousand, nine hundred forty".