83920309 has 16 divisors (see below), whose sum is σ = 93000960. Its totient is φ = 75093760.

The previous prime is 83920267. The next prime is 83920349. The reversal of 83920309 is 90302938.

It is a cyclic number.

It is not a de Polignac number, because 83920309 - 2¹⁵ = 83887541 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 (83920349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351012 + ... + 351250.

It is an arithmetic number, because the mean of its divisors is an integer number (5812560).

Almost surely, 2^83920309 is an apocalyptic number.

It is an amenable number.

83920309 is a deficient number, since it is larger than the sum of its proper divisors (9080651).

83920309 is a wasteful number, since it uses less digits than its factorization.

83920309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 83920309 is about 9160.8028578286. The cubic root of 83920309 is about 437.8133748276.

The spelling of 83920309 in words is "eighty-three million, nine hundred twenty thousand, three hundred nine".