818420287 has 4 divisors (see below), whose sum is σ = 825928840. Its totient is φ = 810911736.

The previous prime is 818420261. The next prime is 818420299. The reversal of 818420287 is 782024818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782024818 = 2 ⋅391012409.

It is a cyclic number.

It is not a de Polignac number, because 818420287 - 2⁷ = 818420159 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 (818420227) 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, 3754113 + ... + 3754330.

It is an arithmetic number, because the mean of its divisors is an integer number (206482210).

Almost surely, 2^818420287 is an apocalyptic number.

818420287 is a deficient number, since it is larger than the sum of its proper divisors (7508553).

818420287 is a wasteful number, since it uses less digits than its factorization.

818420287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7508552.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 818420287 is about 28608.0458437832. The cubic root of 818420287 is about 935.3887207127.

The spelling of 818420287 in words is "eight hundred eighteen million, four hundred twenty thousand, two hundred eighty-seven".