84090917 has 4 divisors (see below), whose sum is σ = 84146016. Its totient is φ = 84035820.

The previous prime is 84090911. The next prime is 84090931. The reversal of 84090917 is 71909048.

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 a de Polignac number, because none of the positive numbers 2^k-84090917 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 (84090911) 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, 25193 + ... + 28334.

It is an arithmetic number, because the mean of its divisors is an integer number (21036504).

Almost surely, 2^84090917 is an apocalyptic number.

It is an amenable number.

84090917 is a deficient number, since it is larger than the sum of its proper divisors (55099).

84090917 is a wasteful number, since it uses less digits than its factorization.

84090917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55098.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 84090917 is about 9170.1099775303. The cubic root of 84090917 is about 438.1098620739.

The spelling of 84090917 in words is "eighty-four million, ninety thousand, nine hundred seventeen".