13998840 has 32 divisors (see below), whose sum is σ = 41996880. Its totient is φ = 3732992.

The previous prime is 13998827. The next prime is 13998841. The reversal of 13998840 is 4889931.

It is a junction number, because it is equal to n+sod(n) for n = 13998792 and 13998801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13998841) 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, 58209 + ... + 58448.

Almost surely, 2^13998840 is an apocalyptic number.

13998840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13998840 is an abundant number, since it is smaller than the sum of its proper divisors (27998040).

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

13998840 is a wasteful number, since it uses less digits than its factorization.

13998840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116671 (or 116667 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 13998840 is about 3741.5023720425. The cubic root of 13998840 is about 241.0075696503.

The spelling of 13998840 in words is "thirteen million, nine hundred ninety-eight thousand, eight hundred forty".