83953821 has 8 divisors (see below), whose sum is σ = 127929664. Its totient is φ = 47973600.

The previous prime is 83953801. The next prime is 83953823. The reversal of 83953821 is 12835938.

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

It is not a de Polignac number, because 83953821 - 2⁶ = 83953757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83953821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83953823) 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, 1998880 + ... + 1998921.

It is an arithmetic number, because the mean of its divisors is an integer number (15991208).

Almost surely, 2^83953821 is an apocalyptic number.

It is an amenable number.

83953821 is a deficient number, since it is larger than the sum of its proper divisors (43975843).

83953821 is a wasteful number, since it uses less digits than its factorization.

83953821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997811.

The product of its digits is 51840, while the sum is 39.

The square root of 83953821 is about 9162.6317725859. The cubic root of 83953821 is about 437.8716445894.

The spelling of 83953821 in words is "eighty-three million, nine hundred fifty-three thousand, eight hundred twenty-one".