1979139 has 4 divisors (see below), whose sum is σ = 2638856. Its totient is φ = 1319424.

The previous prime is 1979129. The next prime is 1979141. The reversal of 1979139 is 9319791.

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

It is not a de Polignac number, because 1979139 - 2⁸ = 1978883 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1979097 and 1979106.

It is not an unprimeable number, because it can be changed into a prime (1979119) 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, 329854 + ... + 329859.

It is an arithmetic number, because the mean of its divisors is an integer number (659714).

2^1979139 is an apocalyptic number.

1979139 is a deficient number, since it is larger than the sum of its proper divisors (659717).

1979139 is an equidigital number, since it uses as much as digits as its factorization.

1979139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659716.

The product of its digits is 15309, while the sum is 39.

The square root of 1979139 is about 1406.8187516521. The cubic root of 1979139 is about 125.5525195125.

The spelling of 1979139 in words is "one million, nine hundred seventy-nine thousand, one hundred thirty-nine".