918441840 has 80 divisors (see below), whose sum is σ = 2863209600. Its totient is φ = 243538176.

The previous prime is 918441809. The next prime is 918441851. The reversal of 918441840 is 48144819.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32271 + ... + 53649.

It is an arithmetic number, because the mean of its divisors is an integer number (35790120).

Almost surely, 2^918441840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 918441840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431604800).

918441840 is an abundant number, since it is smaller than the sum of its proper divisors (1944767760).

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

918441840 is a wasteful number, since it uses less digits than its factorization.

918441840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21574 (or 21568 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 918441840 is about 30305.8053844474. The cubic root of 918441840 is about 972.0394402191.

The spelling of 918441840 in words is "nine hundred eighteen million, four hundred forty-one thousand, eight hundred forty".