1398978979 has 8 divisors (see below), whose sum is σ = 1460657952. Its totient is φ = 1337371200.

The previous prime is 1398978967. The next prime is 1398979003. The reversal of 1398978979 is 9798798931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1398978979 - 2⁷ = 1398978851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398978079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24537 + ... + 58309.

It is an arithmetic number, because the mean of its divisors is an integer number (182582244).

Almost surely, 2^1398978979 is an apocalyptic number.

1398978979 is a deficient number, since it is larger than the sum of its proper divisors (61678973).

1398978979 is a wasteful number, since it uses less digits than its factorization.

1398978979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35597.

The product of its digits is 61725888, while the sum is 70.

The square root of 1398978979 is about 37402.9274121692. The cubic root of 1398978979 is about 1118.4169223945.

The spelling of 1398978979 in words is "one billion, three hundred ninety-eight million, nine hundred seventy-eight thousand, nine hundred seventy-nine".