83820997 has 4 divisors (see below), whose sum is σ = 90268780. Its totient is φ = 77373216.

The previous prime is 83820977. The next prime is 83821013. The reversal of 83820997 is 79902838.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11383876 + 72437121 = 3374^2 + 8511^2 .

It is a cyclic number.

It is not a de Polignac number, because 83820997 - 2¹⁹ = 83296709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83820907) 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, 3223872 + ... + 3223897.

It is an arithmetic number, because the mean of its divisors is an integer number (22567195).

Almost surely, 2^83820997 is an apocalyptic number.

It is an amenable number.

83820997 is a deficient number, since it is larger than the sum of its proper divisors (6447783).

83820997 is a wasteful number, since it uses less digits than its factorization.

83820997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6447782.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 83820997 is about 9155.3807676142. The cubic root of 83820997 is about 437.6406026454.

The spelling of 83820997 in words is "eighty-three million, eight hundred twenty thousand, nine hundred ninety-seven".