1881279 has 8 divisors (see below), whose sum is σ = 2787120. Its totient is φ = 1254168.

The previous prime is 1881277. The next prime is 1881289. The reversal of 1881279 is 9721881.

It is not a de Polignac number, because 1881279 - 2¹ = 1881277 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 (1881277) 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, 34812 + ... + 34865.

It is an arithmetic number, because the mean of its divisors is an integer number (348390).

2^1881279 is an apocalyptic number.

1881279 is a deficient number, since it is larger than the sum of its proper divisors (905841).

1881279 is an equidigital number, since it uses as much as digits as its factorization.

1881279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69686 (or 69680 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1881279 is about 1371.5972440917. The cubic root of 1881279 is about 123.4480978670.

The spelling of 1881279 in words is "one million, eight hundred eighty-one thousand, two hundred seventy-nine".