13439691 has 6 divisors (see below), whose sum is σ = 19412900. Its totient is φ = 8959788.

The previous prime is 13439689. The next prime is 13439737. The reversal of 13439691 is 19693431.

13439691 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13439691 - 2¹ = 13439689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13439191) 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, 746641 + ... + 746658.

Almost surely, 2^13439691 is an apocalyptic number.

13439691 is a deficient number, since it is larger than the sum of its proper divisors (5973209).

13439691 is a wasteful number, since it uses less digits than its factorization.

13439691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493305 (or 1493302 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 13439691 is about 3666.0184123924. The cubic root of 13439691 is about 237.7550560014.

The spelling of 13439691 in words is "thirteen million, four hundred thirty-nine thousand, six hundred ninety-one".