394821042 has 64 divisors (see below), whose sum is σ = 994166784. Its totient is φ = 101543040.

The previous prime is 394821001. The next prime is 394821047. The reversal of 394821042 is 240128493.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 394820994 and 394821012.

It is not an unprimeable number, because it can be changed into a prime (394821047) 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, 43438 + ... + 51734.

It is an arithmetic number, because the mean of its divisors is an integer number (15533856).

Almost surely, 2^394821042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394821042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497083392).

394821042 is an abundant number, since it is smaller than the sum of its proper divisors (599345742).

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

394821042 is a wasteful number, since it uses less digits than its factorization.

394821042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8423.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 394821042 is about 19870.1042272053. The cubic root of 394821042 is about 733.6125689129.

The spelling of 394821042 in words is "three hundred ninety-four million, eight hundred twenty-one thousand, forty-two".