13387861 has 8 divisors (see below), whose sum is σ = 13565880. Its totient is φ = 13211328.

The previous prime is 13387859. The next prime is 13387883. The reversal of 13387861 is 16878331.

13387861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 820836 + 12567025 = 906^2 + 3545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13387861 - 2¹ = 13387859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13387861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13387841) 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, 42075 + ... + 42391.

It is an arithmetic number, because the mean of its divisors is an integer number (1695735).

Almost surely, 2^13387861 is an apocalyptic number.

It is an amenable number.

13387861 is a deficient number, since it is larger than the sum of its proper divisors (178019).

13387861 is a wasteful number, since it uses less digits than its factorization.

13387861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its digits is 24192, while the sum is 37.

The square root of 13387861 is about 3658.9426068196. The cubic root of 13387861 is about 237.4490291356.

The spelling of 13387861 in words is "thirteen million, three hundred eighty-seven thousand, eight hundred sixty-one".