918669840 has 80 divisors (see below), whose sum is σ = 3106783296. Its totient is φ = 222707200.

The previous prime is 918669823. The next prime is 918669847. The reversal of 918669840 is 48966819.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (918669847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171351 + ... + 176630.

Almost surely, 2^918669840 is an apocalyptic number.

It is an amenable number.

918669840 is an abundant number, since it is smaller than the sum of its proper divisors (2188113456).

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

918669840 is a wasteful number, since it uses less digits than its factorization.

918669840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348008 (or 348002 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 918669840 is about 30309.5668065382. The cubic root of 918669840 is about 972.1198687036.

The spelling of 918669840 in words is "nine hundred eighteen million, six hundred sixty-nine thousand, eight hundred forty".