918397818 has 64 divisors (see below), whose sum is σ = 2205342720. Its totient is φ = 281624256.

The previous prime is 918397811. The next prime is 918397819. The reversal of 918397818 is 818793819.

It is a super-2 number, since 2×918397818² = 1686909104214322248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (918397811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220471 + ... + 224597.

It is an arithmetic number, because the mean of its divisors is an integer number (34458480).

Almost surely, 2^918397818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 918397818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102671360).

918397818 is an abundant number, since it is smaller than the sum of its proper divisors (1286944902).

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

918397818 is a wasteful number, since it uses less digits than its factorization.

918397818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468 (or 4462 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 918397818 is about 30305.0790792567. The cubic root of 918397818 is about 972.0239096390.

The spelling of 918397818 in words is "nine hundred eighteen million, three hundred ninety-seven thousand, eight hundred eighteen".