190839881 has 4 divisors (see below), whose sum is σ = 194900352. Its totient is φ = 186779412.

The previous prime is 190839877. The next prime is 190839889. The reversal of 190839881 is 188938091.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 190839881 - 2² = 190839877 is a prime.

It is a super-2 number, since 2×190839881² = 72839720360188322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 4060423 = 190839881 / (1 + 9 + 0 + 8 + 3 + 9 + 8 + 8 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (190839889) 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, 2030165 + ... + 2030258.

It is an arithmetic number, because the mean of its divisors is an integer number (48725088).

Almost surely, 2^190839881 is an apocalyptic number.

It is an amenable number.

190839881 is a deficient number, since it is larger than the sum of its proper divisors (4060471).

190839881 is an equidigital number, since it uses as much as digits as its factorization.

190839881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060470.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 190839881 is about 13814.4808443893. The cubic root of 190839881 is about 575.7355486550.

The spelling of 190839881 in words is "one hundred ninety million, eight hundred thirty-nine thousand, eight hundred eighty-one".