394782840 has 192 divisors, whose sum is σ = 1369236960. Its totient is φ = 98304000.

The previous prime is 394782821. The next prime is 394782847. The reversal of 394782840 is 48287493.

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 (394782847) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1535992 + ... + 1536248.

Almost surely, 2^394782840 is an apocalyptic number.

394782840 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 394782840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684618480).

394782840 is an abundant number, since it is smaller than the sum of its proper divisors (974454120).

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

394782840 is a wasteful number, since it uses less digits than its factorization.

394782840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 394782840 is about 19869.1429105535. The cubic root of 394782840 is about 733.5889072465.

The spelling of 394782840 in words is "three hundred ninety-four million, seven hundred eighty-two thousand, eight hundred forty".