13988340 has 36 divisors (see below), whose sum is σ = 42431844. Its totient is φ = 3730176.

The previous prime is 13988321. The next prime is 13988341. The reversal of 13988340 is 4388931.

It can be written as a sum of positive squares in 2 ways, for example, as 5934096 + 8054244 = 2436^2 + 2838^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13988295 and 13988304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13988341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38677 + ... + 39036.

Almost surely, 2^13988340 is an apocalyptic number.

13988340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13988340 is an abundant number, since it is smaller than the sum of its proper divisors (28443504).

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

13988340 is a wasteful number, since it uses less digits than its factorization.

13988340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77728 (or 77723 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 13988340 is about 3740.0989291729. The cubic root of 13988340 is about 240.9472976934.

The spelling of 13988340 in words is "thirteen million, nine hundred eighty-eight thousand, three hundred forty".