13399786 has 4 divisors (see below), whose sum is σ = 20099682. Its totient is φ = 6699892.

The previous prime is 13399709. The next prime is 13399811. The reversal of 13399786 is 68799331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68799331 = 5309 ⋅12959.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 690561 = 3565^2 + 831^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349945 + ... + 3349948.

Almost surely, 2^13399786 is an apocalyptic number.

13399786 is a deficient number, since it is larger than the sum of its proper divisors (6699896).

13399786 is an equidigital number, since it uses as much as digits as its factorization.

13399786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6699895.

The product of its digits is 244944, while the sum is 46.

The square root of 13399786 is about 3660.5718132554. The cubic root of 13399786 is about 237.5195093854.

The spelling of 13399786 in words is "thirteen million, three hundred ninety-nine thousand, seven hundred eighty-six".