6439046394 has 64 divisors (see below), whose sum is σ = 14530129920. Its totient is φ = 1884624000.

The previous prime is 6439046359. The next prime is 6439046399. The reversal of 6439046394 is 4936409346.

It is a super-2 number, since 2×6439046394² = 82922636928168806472, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6439046399) 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, 1161409 + ... + 1166939.

It is an arithmetic number, because the mean of its divisors is an integer number (227033280).

Almost surely, 2^6439046394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6439046394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7265064960).

6439046394 is an abundant number, since it is smaller than the sum of its proper divisors (8091083526).

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

6439046394 is a wasteful number, since it uses less digits than its factorization.

6439046394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147.

The product of its (nonzero) digits is 1679616, while the sum is 48.

The square root of 6439046394 is about 80243.6688717559. The cubic root of 6439046394 is about 1860.4036579114.

The spelling of 6439046394 in words is "six billion, four hundred thirty-nine million, forty-six thousand, three hundred ninety-four".