1993979 has 8 divisors (see below), whose sum is σ = 2162832. Its totient is φ = 1827360.

The previous prime is 1993973. The next prime is 1993991. The reversal of 1993979 is 9793991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1993979 - 2⁴ = 1993963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993973) 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, 1649 + ... + 2589.

It is an arithmetic number, because the mean of its divisors is an integer number (270354).

2^1993979 is an apocalyptic number.

1993979 is a deficient number, since it is larger than the sum of its proper divisors (168853).

1993979 is a wasteful number, since it uses less digits than its factorization.

1993979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

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

The square root of 1993979 is about 1412.0832128455. The cubic root of 1993979 is about 125.8655448239.

The spelling of 1993979 in words is "one million, nine hundred ninety-three thousand, nine hundred seventy-nine".