83949891 has 8 divisors (see below), whose sum is σ = 115544064. Its totient is φ = 54161160.

The previous prime is 83949883. The next prime is 83949913. The reversal of 83949891 is 19894938.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83949891 - 2³ = 83949883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83949851) 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 7 ways as a sum of consecutive naturals, for example, 451251 + ... + 451436.

It is an arithmetic number, because the mean of its divisors is an integer number (14443008).

Almost surely, 2^83949891 is an apocalyptic number.

83949891 is a deficient number, since it is larger than the sum of its proper divisors (31594173).

83949891 is a wasteful number, since it uses less digits than its factorization.

83949891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902721.

The product of its digits is 559872, while the sum is 51.

The square root of 83949891 is about 9162.4173120416. The cubic root of 83949891 is about 437.8648120141.

The spelling of 83949891 in words is "eighty-three million, nine hundred forty-nine thousand, eight hundred ninety-one".