1881379 has 4 divisors (see below), whose sum is σ = 1925176. Its totient is φ = 1837584.

The previous prime is 1881349. The next prime is 1881389. The reversal of 1881379 is 9731881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9731881 = 271 ⋅35911.

It is a cyclic number.

It is not a de Polignac number, because 1881379 - 2¹⁹ = 1357091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21834 + ... + 21919.

It is an arithmetic number, because the mean of its divisors is an integer number (481294).

2^1881379 is an apocalyptic number.

1881379 is a deficient number, since it is larger than the sum of its proper divisors (43797).

1881379 is an equidigital number, since it uses as much as digits as its factorization.

1881379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43796.

The product of its digits is 12096, while the sum is 37.

The square root of 1881379 is about 1371.6336974572. The cubic root of 1881379 is about 123.4502851362.

The spelling of 1881379 in words is "one million, eight hundred eighty-one thousand, three hundred seventy-nine".