13387986 has 12 divisors (see below), whose sum is σ = 29007342. Its totient is φ = 4462656.

The previous prime is 13387967. The next prime is 13387987. The reversal of 13387986 is 68978331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 962361 = 3525^2 + 981^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13387987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371871 + ... + 371906.

Almost surely, 2^13387986 is an apocalyptic number.

13387986 is an abundant number, since it is smaller than the sum of its proper divisors (15619356).

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

13387986 is a wasteful number, since it uses less digits than its factorization.

13387986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743785 (or 743782 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 13387986 is about 3658.9596882174. The cubic root of 13387986 is about 237.4497681393.

The spelling of 13387986 in words is "thirteen million, three hundred eighty-seven thousand, nine hundred eighty-six".