1979979 has 8 divisors (see below), whose sum is σ = 2676432. Its totient is φ = 1301760.

The previous prime is 1979947. The next prime is 1979993. The reversal of 1979979 is 9799791.

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

It is not a de Polignac number, because 1979979 - 2⁵ = 1979947 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1979779) 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, 4302 + ... + 4739.

It is an arithmetic number, because the mean of its divisors is an integer number (334554).

2^1979979 is an apocalyptic number.

1979979 is a deficient number, since it is larger than the sum of its proper divisors (696453).

1979979 is an equidigital number, since it uses as much as digits as its factorization.

1979979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9117.

The product of its digits is 321489, while the sum is 51.

The square root of 1979979 is about 1407.1172659022. The cubic root of 1979979 is about 125.5702796259.

The spelling of 1979979 in words is "one million, nine hundred seventy-nine thousand, nine hundred seventy-nine".