83402309 has 2 divisors, whose sum is σ = 83402310. Its totient is φ = 83402308.

The previous prime is 83402279. The next prime is 83402321. The reversal of 83402309 is 90320438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43270084 + 40132225 = 6578^2 + 6335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83402309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83402339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41701154 + 41701155.

It is an arithmetic number, because the mean of its divisors is an integer number (41701155).

Almost surely, 2^83402309 is an apocalyptic number.

It is an amenable number.

83402309 is a deficient number, since it is larger than the sum of its proper divisors (1).

83402309 is an equidigital number, since it uses as much as digits as its factorization.

83402309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 83402309 is about 9132.4864631709. The cubic root of 83402309 is about 436.9107107238.

The spelling of 83402309 in words is "eighty-three million, four hundred two thousand, three hundred nine".