1979791 has 4 divisors (see below), whose sum is σ = 2159784. Its totient is φ = 1799800.

The previous prime is 1979779. The next prime is 1979807.

1979791 is nontrivially palindromic in base 2 and base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1979791 - 2¹¹ = 1977743 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89980 + ... + 90001.

It is an arithmetic number, because the mean of its divisors is an integer number (539946).

2^1979791 is an apocalyptic number.

1979791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1979791 is a deficient number, since it is larger than the sum of its proper divisors (179993).

1979791 is a wasteful number, since it uses less digits than its factorization.

1979791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179992.

The product of its digits is 35721, while the sum is 43.

The square root of 1979791 is about 1407.0504610710. The cubic root of 1979791 is about 125.5663051798.

The spelling of 1979791 in words is "one million, nine hundred seventy-nine thousand, seven hundred ninety-one".