818402040 has 192 divisors, whose sum is σ = 2771215200. Its totient is φ = 209212416.

The previous prime is 818402021. The next prime is 818402059. The reversal of 818402040 is 40204818.

It is an interprime number because it is at equal distance from previous prime (818402021) and next prime (818402059).

It is a junction number, because it is equal to n+sod(n) for n = 818401995 and 818402013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2891739 + ... + 2892021.

Almost surely, 2^818402040 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 818402040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385607600).

818402040 is an abundant number, since it is smaller than the sum of its proper divisors (1952813160).

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

818402040 is a wasteful number, since it uses less digits than its factorization.

818402040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 818402040 is about 28607.7269282269. The cubic root of 818402040 is about 935.3817690420.

Adding to 818402040 its reverse (40204818), we get a palindrome (858606858).

The spelling of 818402040 in words is "eight hundred eighteen million, four hundred two thousand, forty".