83390557 has 4 divisors (see below), whose sum is σ = 84170016. Its totient is φ = 82611100.

The previous prime is 83390543. The next prime is 83390561. The reversal of 83390557 is 75509338.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83390557 - 2⁷ = 83390429 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83390537) 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, 389569 + ... + 389782.

It is an arithmetic number, because the mean of its divisors is an integer number (21042504).

Almost surely, 2^83390557 is an apocalyptic number.

It is an amenable number.

83390557 is a deficient number, since it is larger than the sum of its proper divisors (779459).

83390557 is a wasteful number, since it uses less digits than its factorization.

83390557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779458.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 83390557 is about 9131.8430231799. The cubic root of 83390557 is about 436.8901884469.

The spelling of 83390557 in words is "eighty-three million, three hundred ninety thousand, five hundred fifty-seven".