394494840 has 128 divisors (see below), whose sum is σ = 1357516800. Its totient is φ = 101796480.

The previous prime is 394494839. The next prime is 394494883. The reversal of 394494840 is 48494493.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27589 + ... + 39371.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600).

Almost surely, 2^394494840 is an apocalyptic number.

394494840 is a gapful number since it is divisible by the number (30) 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 394494840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678758400).

394494840 is an abundant number, since it is smaller than the sum of its proper divisors (963021960).

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

394494840 is a wasteful number, since it uses less digits than its factorization.

394494840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11834 (or 11824 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 394494840 is about 19861.8941694895. The cubic root of 394494840 is about 733.4104758150.

The spelling of 394494840 in words is "three hundred ninety-four million, four hundred ninety-four thousand, eight hundred forty".