1779881 has 2 divisors, whose sum is σ = 1779882. Its totient is φ = 1779880.

The previous prime is 1779871. The next prime is 1779889. The reversal of 1779881 is 1889771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 434281 = 1160^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779881 - 2¹⁰ = 1778857 is a prime.

It is a super-2 number, since 2×1779881² = 6335952748322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1779889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889940 + 889941.

It is an arithmetic number, because the mean of its divisors is an integer number (889941).

2^1779881 is an apocalyptic number.

It is an amenable number.

1779881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779881 is an equidigital number, since it uses as much as digits as its factorization.

1779881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 41.

The square root of 1779881 is about 1334.1218085317. The cubic root of 1779881 is about 121.1891266337.

The spelling of 1779881 in words is "one million, seven hundred seventy-nine thousand, eight hundred eighty-one".