818993340 has 216 divisors, whose sum is σ = 2821064064. Its totient is φ = 191980800.

The previous prime is 818993339. The next prime is 818993341. The reversal of 818993340 is 43399818.

It is an interprime number because it is at equal distance from previous prime (818993339) and next prime (818993341).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818993341) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 674574 + ... + 675786.

Almost surely, 2^818993340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818993340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410532032).

818993340 is an abundant number, since it is smaller than the sum of its proper divisors (2002070724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818993340 is a wasteful number, since it uses less digits than its factorization.

818993340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 818993340 is about 28618.0596826549. The cubic root of 818993340 is about 935.6069876439.

The spelling of 818993340 in words is "eight hundred eighteen million, nine hundred ninety-three thousand, three hundred forty".