1379881 has 4 divisors (see below), whose sum is σ = 1402564. Its totient is φ = 1357200.

The previous prime is 1379879. The next prime is 1379887. The reversal of 1379881 is 1889731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1889731 = 41 ⋅46091.

It can be written as a sum of positive squares in 2 ways, for example, as 714025 + 665856 = 845^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379881 - 2¹ = 1379879 is a prime.

It is a super-2 number, since 2×1379881² = 3808143148322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1379881.

It is not an unprimeable number, because it can be changed into a prime (1379887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11250 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (350641).

2^1379881 is an apocalyptic number.

It is an amenable number.

1379881 is a deficient number, since it is larger than the sum of its proper divisors (22683).

1379881 is an equidigital number, since it uses as much as digits as its factorization.

1379881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22682.

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

The square root of 1379881 is about 1174.6833615915. The cubic root of 1379881 is about 111.3304278906.

The spelling of 1379881 in words is "one million, three hundred seventy-nine thousand, eight hundred eighty-one".