13990040 has 32 divisors (see below), whose sum is σ = 31596480. Its totient is φ = 5574912.

The previous prime is 13990013. The next prime is 13990043. The reversal of 13990040 is 4009931.

It is a happy number.

13990040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 13989991 and 13990009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13990043) 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, 14204 + ... + 15156.

It is an arithmetic number, because the mean of its divisors is an integer number (987390).

Almost surely, 2^13990040 is an apocalyptic number.

13990040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13990040 is an abundant number, since it is smaller than the sum of its proper divisors (17606440).

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

13990040 is a wasteful number, since it uses less digits than its factorization.

13990040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 13990040 is about 3740.3261889841. The cubic root of 13990040 is about 240.9570580560.

Adding to 13990040 its reverse (4009931), we get a palindrome (17999971).

The spelling of 13990040 in words is "thirteen million, nine hundred ninety thousand, forty".