394840980 has 240 divisors, whose sum is σ = 1339208640. Its totient is φ = 97417728.

The previous prime is 394840967. The next prime is 394840981. The reversal of 394840980 is 89048493.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394840981) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6692191 + ... + 6692249.

It is an arithmetic number, because the mean of its divisors is an integer number (5580036).

Almost surely, 2^394840980 is an apocalyptic number.

394840980 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 394840980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669604320).

394840980 is an abundant number, since it is smaller than the sum of its proper divisors (944367660).

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

394840980 is an equidigital number, since it uses as much as digits as its factorization.

394840980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 394840980 is about 19870.6059293621. The cubic root of 394840980 is about 733.6249175634.

The spelling of 394840980 in words is "three hundred ninety-four million, eight hundred forty thousand, nine hundred eighty".