1399729689 has 12 divisors (see below), whose sum is σ = 2091550500. Its totient is φ = 900975264.

The previous prime is 1399729673. The next prime is 1399729693. The reversal of 1399729689 is 9869279931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 376049664 + 1023680025 = 19392^2 + 31995^2 .

It is not a de Polignac number, because 1399729689 - 2⁴ = 1399729673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399729619) 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, 2681214 + ... + 2681735.

It is an arithmetic number, because the mean of its divisors is an integer number (174295875).

Almost surely, 2^1399729689 is an apocalyptic number.

It is an amenable number.

1399729689 is a deficient number, since it is larger than the sum of its proper divisors (691820811).

1399729689 is a wasteful number, since it uses less digits than its factorization.

1399729689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5362984 (or 5362981 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The square root of 1399729689 is about 37412.9615106850. The cubic root of 1399729689 is about 1118.6169388931.

The spelling of 1399729689 in words is "one billion, three hundred ninety-nine million, seven hundred twenty-nine thousand, six hundred eighty-nine".