1879921 has 2 divisors, whose sum is σ = 1879922. Its totient is φ = 1879920.

The previous prime is 1879909. The next prime is 1879931. The reversal of 1879921 is 1299781.

1879921 = T₁₁₁₈ + T₁₁₁₉ + T₁₁₂₀.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950625 + 929296 = 975^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1879921 - 2¹¹ = 1877873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1879901) 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, 939960 + 939961.

It is an arithmetic number, because the mean of its divisors is an integer number (939961).

2^1879921 is an apocalyptic number.

1879921 is the 1120-th centered triangular number.

It is an amenable number.

1879921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1879921 is an equidigital number, since it uses as much as digits as its factorization.

1879921 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 1879921 is about 1371.1021114417. The cubic root of 1879921 is about 123.4183870744.

The spelling of 1879921 in words is "one million, eight hundred seventy-nine thousand, nine hundred twenty-one".