918646329 has 4 divisors (see below), whose sum is σ = 1224861776. Its totient is φ = 612430884.

The previous prime is 918646327. The next prime is 918646331. The reversal of 918646329 is 923646819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 923646819 = 3 ⋅307882273.

It is an interprime number because it is at equal distance from previous prime (918646327) and next prime (918646331).

It is not a de Polignac number, because 918646329 - 2¹ = 918646327 is a prime.

It is a super-2 number, since 2×918646329² = 1687822155570352482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918646327) 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, 153107719 + ... + 153107724.

It is an arithmetic number, because the mean of its divisors is an integer number (306215444).

Almost surely, 2^918646329 is an apocalyptic number.

It is an amenable number.

918646329 is a deficient number, since it is larger than the sum of its proper divisors (306215447).

918646329 is a wasteful number, since it uses less digits than its factorization.

918646329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306215446.

The product of its digits is 559872, while the sum is 48.

The square root of 918646329 is about 30309.1789562172. The cubic root of 918646329 is about 972.1115756607. Note that the first 3 decimals are identical.

The spelling of 918646329 in words is "nine hundred eighteen million, six hundred forty-six thousand, three hundred twenty-nine".