83921966 has 4 divisors (see below), whose sum is σ = 125882952. Its totient is φ = 41960982.

The previous prime is 83921951. The next prime is 83921977. The reversal of 83921966 is 66912938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66912938 = 2 ⋅33456469.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20980490 + ... + 20980493.

It is an arithmetic number, because the mean of its divisors is an integer number (31470738).

Almost surely, 2^83921966 is an apocalyptic number.

83921966 is a deficient number, since it is larger than the sum of its proper divisors (41960986).

83921966 is a wasteful number, since it uses less digits than its factorization.

83921966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41960985.

The product of its digits is 139968, while the sum is 44.

The square root of 83921966 is about 9160.8932970535. The cubic root of 83921966 is about 437.8162563390.

Subtracting from 83921966 its reverse (66912938), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 83921966 in words is "eighty-three million, nine hundred twenty-one thousand, nine hundred sixty-six".