918381040 has 40 divisors (see below), whose sum is σ = 2136992688. Its totient is φ = 367050240.

The previous prime is 918381029. The next prime is 918381041. The reversal of 918381040 is 40183819.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 918380987 and 918381005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918381041) 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 in 7 ways as a sum of consecutive naturals, for example, 110635 + ... + 118645.

Almost surely, 2^918381040 is an apocalyptic number.

It is an amenable number.

918381040 is an abundant number, since it is smaller than the sum of its proper divisors (1218611648).

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

918381040 is a wasteful number, since it uses less digits than its factorization.

918381040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9457 (or 9451 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 918381040 is about 30304.8022597079. The cubic root of 918381040 is about 972.0179903753.

The spelling of 918381040 in words is "nine hundred eighteen million, three hundred eighty-one thousand, forty".