918931906 has 8 divisors (see below), whose sum is σ = 1459480140. Its totient is φ = 432438528.

The previous prime is 918931901. The next prime is 918931969. The reversal of 918931906 is 609139819.

918931906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 795522025 + 123409881 = 28205^2 + 11109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×918931906³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (918931901) 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, 13513671 + ... + 13513738.

Almost surely, 2^918931906 is an apocalyptic number.

918931906 is a deficient number, since it is larger than the sum of its proper divisors (540548234).

918931906 is a wasteful number, since it uses less digits than its factorization.

918931906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027428.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 918931906 is about 30313.8896547441. The cubic root of 918931906 is about 972.2122977546.

The spelling of 918931906 in words is "nine hundred eighteen million, nine hundred thirty-one thousand, nine hundred six".