394804139990 has 32 divisors (see below), whose sum is σ = 776091710016. Its totient is φ = 143720680320.

The previous prime is 394804139941. The next prime is 394804139999. The reversal of 394804139990 is 99931408493.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394804139999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21377777 + ... + 21396236.

It is an arithmetic number, because the mean of its divisors is an integer number (24252865938).

Almost surely, 2^394804139990 is an apocalyptic number.

394804139990 is a deficient number, since it is larger than the sum of its proper divisors (381287570026).

394804139990 is a wasteful number, since it uses less digits than its factorization.

394804139990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42774104.

The product of its (nonzero) digits is 7558272, while the sum is 59.

The spelling of 394804139990 in words is "three hundred ninety-four billion, eight hundred four million, one hundred thirty-nine thousand, nine hundred ninety".