83981890 has 16 divisors (see below), whose sum is σ = 152990208. Its totient is φ = 33187696.

The previous prime is 83981861. The next prime is 83981893. The reversal of 83981890 is 9818938.

It is a self number, because there is not a number n which added to its sum of digits gives 83981890.

It is not an unprimeable number, because it can be changed into a prime (83981893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49762 + ... + 51421.

It is an arithmetic number, because the mean of its divisors is an integer number (9561888).

Almost surely, 2^83981890 is an apocalyptic number.

83981890 is a deficient number, since it is larger than the sum of its proper divisors (69008318).

83981890 is a wasteful number, since it uses less digits than its factorization.

83981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101273.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 83981890 is about 9164.1633551569. The cubic root of 83981890 is about 437.9204382776.

The spelling of 83981890 in words is "eighty-three million, nine hundred eighty-one thousand, eight hundred ninety".