1921879 has 2 divisors, whose sum is σ = 1921880. Its totient is φ = 1921878.

The previous prime is 1921873. The next prime is 1921883. The reversal of 1921879 is 9781291.

1921879 is nontrivially palindromic in base 8.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1921879 - 2⁵ = 1921847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921873) 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 as a sum of consecutive naturals, namely, 960939 + 960940.

It is an arithmetic number, because the mean of its divisors is an integer number (960940).

2^1921879 is an apocalyptic number.

1921879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921879 is an equidigital number, since it uses as much as digits as its factorization.

1921879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 1921879 is about 1386.3185059718. The cubic root of 1921879 is about 124.3298320875.

The spelling of 1921879 in words is "one million, nine hundred twenty-one thousand, eight hundred seventy-nine".