1390689279 has 12 divisors (see below), whose sum is σ = 2295741136. Its totient is φ = 794679552.

The previous prime is 1390689277. The next prime is 1390689299. The reversal of 1390689279 is 9729860931.

It is not a de Polignac number, because 1390689279 - 2¹ = 1390689277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390689277) 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, 11037154 + ... + 11037279.

Almost surely, 2^1390689279 is an apocalyptic number.

1390689279 is a deficient number, since it is larger than the sum of its proper divisors (905051857).

1390689279 is a wasteful number, since it uses less digits than its factorization.

1390689279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22074446 (or 22074443 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 1390689279 is about 37291.9465702717. The cubic root of 1390689279 is about 1116.2034714948.

The spelling of 1390689279 in words is "one billion, three hundred ninety million, six hundred eighty-nine thousand, two hundred seventy-nine".