1399979 has 6 divisors (see below), whose sum is σ = 1628604. Its totient is φ = 1199940.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399979 is 9799931.

It is a happy number.

It is not a de Polignac number, because 1399979 - 2⁴ = 1399963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399919) 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, 14237 + ... + 14334.

It is an arithmetic number, because the mean of its divisors is an integer number (271434).

2^1399979 is an apocalyptic number.

1399979 is a deficient number, since it is larger than the sum of its proper divisors (228625).

1399979 is an equidigital number, since it uses as much as digits as its factorization.

1399979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28585 (or 28578 counting only the distinct ones).

The product of its digits is 137781, while the sum is 47.

The square root of 1399979 is about 1183.2070824670. The cubic root of 1399979 is about 111.8683348609.

The spelling of 1399979 in words is "one million, three hundred ninety-nine thousand, nine hundred seventy-nine".