394080840 has 48 divisors (see below), whose sum is σ = 1280763900. Its totient is φ = 105088128.

The previous prime is 394080809. The next prime is 394080847. The reversal of 394080840 is 48080493.

It can be written as a sum of positive squares in 2 ways, for example, as 352012644 + 42068196 = 18762^2 + 6486^2 .

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 = 394080795 and 394080804.

It is not an unprimeable number, because it can be changed into a prime (394080847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546975 + ... + 547694.

Almost surely, 2^394080840 is an apocalyptic number.

394080840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394080840 is an abundant number, since it is smaller than the sum of its proper divisors (886683060).

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

394080840 is a wasteful number, since it uses less digits than its factorization.

394080840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094686 (or 1094679 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 394080840 is about 19851.4694670193. The cubic root of 394080840 is about 733.1538284244.

The spelling of 394080840 in words is "three hundred ninety-four million, eighty thousand, eight hundred forty".