13747640 has 32 divisors (see below), whose sum is σ = 32562000. Its totient is φ = 5209344.

The previous prime is 13747639. The next prime is 13747651. The reversal of 13747640 is 4674731.

It is a happy number.

13747640 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 = 13747597 and 13747606.

It is a congruent number.

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, 8285 + ... + 9804.

Almost surely, 2^13747640 is an apocalyptic number.

13747640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13747640 is an abundant number, since it is smaller than the sum of its proper divisors (18814360).

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

13747640 is a wasteful number, since it uses less digits than its factorization.

13747640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18119 (or 18115 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 13747640 is about 3707.7810075569. The cubic root of 13747640 is about 239.5572857042.

The spelling of 13747640 in words is "thirteen million, seven hundred forty-seven thousand, six hundred forty".