890381881 has 4 divisors (see below), whose sum is σ = 890555764. Its totient is φ = 890208000.

The previous prime is 890381879. The next prime is 890381893. The reversal of 890381881 is 188183098.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 249482025 + 640899856 = 15795^2 + 25316^2 .

It is a cyclic number.

It is not a de Polignac number, because 890381881 - 2¹ = 890381879 is a prime.

It is a super-2 number, since 2×890381881² = 1585559788026196322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (890381281) 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, 79020 + ... + 89581.

It is an arithmetic number, because the mean of its divisors is an integer number (222638941).

Almost surely, 2^890381881 is an apocalyptic number.

It is an amenable number.

890381881 is a deficient number, since it is larger than the sum of its proper divisors (173883).

890381881 is a wasteful number, since it uses less digits than its factorization.

890381881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173882.

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 890381881 is about 29839.2674340373. The cubic root of 890381881 is about 962.0377292383.

The spelling of 890381881 in words is "eight hundred ninety million, three hundred eighty-one thousand, eight hundred eighty-one".