1955881 has 4 divisors (see below), whose sum is σ = 1959552. Its totient is φ = 1952212.

The previous prime is 1955873. The next prime is 1955887. The reversal of 1955881 is 1885591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1885591 = 109 ⋅17299.

It is a cyclic number.

It is not a de Polignac number, because 1955881 - 2³ = 1955873 is a prime.

It is a super-2 number, since 2×1955881² = 7650940972322, 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 1955881.

It is not an unprimeable number, because it can be changed into a prime (1955887) 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, 865 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (489888).

2^1955881 is an apocalyptic number.

It is an amenable number.

1955881 is a deficient number, since it is larger than the sum of its proper divisors (3671).

1955881 is an equidigital number, since it uses as much as digits as its factorization.

1955881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670.

The product of its digits is 14400, while the sum is 37.

The square root of 1955881 is about 1398.5281548828. The cubic root of 1955881 is about 125.0587670338.

The spelling of 1955881 in words is "one million, nine hundred fifty-five thousand, eight hundred eighty-one".