394780 has 12 divisors (see below), whose sum is σ = 829080. Its totient is φ = 157904.

The previous prime is 394759. The next prime is 394787. The reversal of 394780 is 87493.

394780 = T₁₄₇ + T₁₄₈ + ... + T₁₇₆.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9850 + ... + 9889.

It is an arithmetic number, because the mean of its divisors is an integer number (69090).

2³⁹⁴⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

394780 is an abundant number, since it is smaller than the sum of its proper divisors (434300).

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

394780 is a wasteful number, since it uses less digits than its factorization.

394780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19748 (or 19746 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 394780 is about 628.3152075193. The cubic root of 394780 is about 73.3587148138.

The spelling of 394780 in words is "three hundred ninety-four thousand, seven hundred eighty".