8409493 has 2 divisors, whose sum is σ = 8409494.
Its totient is φ = 8409492.
The previous prime is 8409491. The next prime is 8409497. The reversal of 8409493 is 3949048.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 5726449 + 2683044 = 2393^2 + 1638^2
It is a cyclic number.
It is not a de Polignac number, because 8409493 - 21 = 8409491 is a prime.
Together with 8409491, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (8409491) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4204746 + 4204747.
It is an arithmetic number, because the mean of its divisors is an integer number (4204747).
Almost surely, 28409493 is an apocalyptic number.
It is an amenable number.
8409493 is a deficient number, since it is larger than the sum of its proper divisors (1).
8409493 is an equidigital number, since it uses as much as digits as its factorization.
8409493 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 31104, while the sum is 37.
The square root of 8409493 is about 2899.9125848894.
The cubic root of 8409493 is about 203.3558191264.
The spelling of 8409493 in words is "eight million, four hundred nine thousand, four hundred ninety-three".