1339979 has 4 divisors (see below), whose sum is σ = 1343520. Its totient is φ = 1336440.

The previous prime is 1339973. The next prime is 1339993. The reversal of 1339979 is 9799331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1339979 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 (1339973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124 + ... + 1985.

It is an arithmetic number, because the mean of its divisors is an integer number (335880).

2^1339979 is an apocalyptic number.

1339979 is a deficient number, since it is larger than the sum of its proper divisors (3541).

1339979 is an equidigital number, since it uses as much as digits as its factorization.

1339979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540.

The product of its digits is 45927, while the sum is 41.

The square root of 1339979 is about 1157.5746196250. The cubic root of 1339979 is about 110.2468012228.

The spelling of 1339979 in words is "one million, three hundred thirty-nine thousand, nine hundred seventy-nine".