494421840 has 160 divisors (see below), whose sum is σ = 1857916800. Its totient is φ = 119854080.

The previous prime is 494421817. The next prime is 494421847. The reversal of 494421840 is 48124494.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 494421795 and 494421804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494421847) 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, 13356 + ... + 34164.

It is an arithmetic number, because the mean of its divisors is an integer number (11611980).

Almost surely, 2^494421840 is an apocalyptic number.

494421840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 494421840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928958400).

494421840 is an abundant number, since it is smaller than the sum of its proper divisors (1363494960).

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

494421840 is a wasteful number, since it uses less digits than its factorization.

494421840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20842 (or 20830 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 494421840 is about 22235.5984853118. The cubic root of 494421840 is about 790.7378887897.

The spelling of 494421840 in words is "four hundred ninety-four million, four hundred twenty-one thousand, eight hundred forty".