920889918 has 64 divisors (see below), whose sum is σ = 2207822400. Its totient is φ = 282839040.

The previous prime is 920889901. The next prime is 920889919. The reversal of 920889918 is 819988029.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920889919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 617718 + ... + 619206.

It is an arithmetic number, because the mean of its divisors is an integer number (34497225).

Almost surely, 2^920889918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 920889918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103911200).

920889918 is an abundant number, since it is smaller than the sum of its proper divisors (1286932482).

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

920889918 is a wasteful number, since it uses less digits than its factorization.

920889918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 920889918 is about 30346.1680941762. The cubic root of 920889918 is about 972.9023209212.

The spelling of 920889918 in words is "nine hundred twenty million, eight hundred eighty-nine thousand, nine hundred eighteen".