918312394 has 4 divisors (see below), whose sum is σ = 1377468594. Its totient is φ = 459156196.

The previous prime is 918312391. The next prime is 918312401. The reversal of 918312394 is 493213819.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 917302369 + 1010025 = 30287^2 + 1005^2 .

It is a super-2 number, since 2×918312394² = 1686595305948022472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (918312391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229578097 + ... + 229578100.

Almost surely, 2^918312394 is an apocalyptic number.

918312394 is a deficient number, since it is larger than the sum of its proper divisors (459156200).

918312394 is a wasteful number, since it uses less digits than its factorization.

918312394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459156199.

The product of its digits is 46656, while the sum is 40.

The square root of 918312394 is about 30303.6696457706. The cubic root of 918312394 is about 971.9937713759.

The spelling of 918312394 in words is "nine hundred eighteen million, three hundred twelve thousand, three hundred ninety-four".