1398979 has 2 divisors, whose sum is σ = 1398980. Its totient is φ = 1398978.

The previous prime is 1398977. The next prime is 1398997. The reversal of 1398979 is 9798931.

Together with next prime (1398997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1398979 - 2¹ = 1398977 is a prime.

Together with 1398977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1398973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699489 + 699490.

It is an arithmetic number, because the mean of its divisors is an integer number (699490).

2^1398979 is an apocalyptic number.

1398979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398979 is an equidigital number, since it uses as much as digits as its factorization.

1398979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1398979 is about 1182.7844266814. The cubic root of 1398979 is about 111.8416927991.

The spelling of 1398979 in words is "one million, three hundred ninety-eight thousand, nine hundred seventy-nine".