1398289779 has 6 divisors (see below), whose sum is σ = 2019751916. Its totient is φ = 932193180.

The previous prime is 1398289771. The next prime is 1398289817. The reversal of 1398289779 is 9779828931.

It is not a de Polignac number, because 1398289779 - 2³ = 1398289771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398289771) 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, 77682757 + ... + 77682774.

Almost surely, 2^1398289779 is an apocalyptic number.

1398289779 is a deficient number, since it is larger than the sum of its proper divisors (621462137).

1398289779 is a wasteful number, since it uses less digits than its factorization.

1398289779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155365537 (or 155365534 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 1398289779 is about 37393.7130945832. The cubic root of 1398289779 is about 1118.2332313912.

The spelling of 1398289779 in words is "one billion, three hundred ninety-eight million, two hundred eighty-nine thousand, seven hundred seventy-nine".