1958881 has 4 divisors (see below), whose sum is σ = 2062000. Its totient is φ = 1855764.

The previous prime is 1958867. The next prime is 1958897. The reversal of 1958881 is 1888591.

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: 1888591 = 37 ⋅51043.

It is a cyclic number.

It is not a de Polignac number, because 1958881 - 2⁷ = 1958753 is a prime.

It is a super-2 number, since 2×1958881² = 7674429544322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1958821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51531 + ... + 51568.

It is an arithmetic number, because the mean of its divisors is an integer number (515500).

2^1958881 is an apocalyptic number.

It is an amenable number.

1958881 is a deficient number, since it is larger than the sum of its proper divisors (103119).

1958881 is a wasteful number, since it uses less digits than its factorization.

1958881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103118.

The product of its digits is 23040, while the sum is 40.

The square root of 1958881 is about 1399.6003000857. The cubic root of 1958881 is about 125.1226742355.

The spelling of 1958881 in words is "one million, nine hundred fifty-eight thousand, eight hundred eighty-one".