13949778789 has 12 divisors (see below), whose sum is σ = 20151237600. Its totient is φ = 9299133864.

The previous prime is 13949778767. The next prime is 13949778803. The reversal of 13949778789 is 98787794931.

13949778789 is a `hidden beast` number, since 1 + 394 + 97 + 78 + 7 + 89 = 666.

It is not a de Polignac number, because 13949778789 - 2¹⁷ = 13949647717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13949778719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80322 + ... + 185340.

It is an arithmetic number, because the mean of its divisors is an integer number (1679269800).

Almost surely, 2^13949778789 is an apocalyptic number.

It is an amenable number.

13949778789 is a deficient number, since it is larger than the sum of its proper divisors (6201458811).

13949778789 is a wasteful number, since it uses less digits than its factorization.

13949778789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119784 (or 119781 counting only the distinct ones).

The product of its digits is 192036096, while the sum is 72.

The spelling of 13949778789 in words is "thirteen billion, nine hundred forty-nine million, seven hundred seventy-eight thousand, seven hundred eighty-nine".