83839720 has 16 divisors (see below), whose sum is σ = 188639460. Its totient is φ = 33535872.

The previous prime is 83839709. The next prime is 83839739. The reversal of 83839720 is 2793838.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81324324 + 2515396 = 9018^2 + 1586^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2095993 = 83839720 / (8 + 3 + 8 + 3 + 9 + 7 + 2 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1047957 + ... + 1048036.

Almost surely, 2^83839720 is an apocalyptic number.

It is an amenable number.

83839720 is an abundant number, since it is smaller than the sum of its proper divisors (104799740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83839720 is a wasteful number, since it uses less digits than its factorization.

83839720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096004 (or 2096000 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 83839720 is about 9156.4032239739. The cubic root of 83839720 is about 437.6731853127.

The spelling of 83839720 in words is "eighty-three million, eight hundred thirty-nine thousand, seven hundred twenty".