6404039490 has 64 divisors (see below), whose sum is σ = 16211145600. Its totient is φ = 1614610944.

The previous prime is 6404039461. The next prime is 6404039501. The reversal of 6404039490 is 949304046.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279094 + ... + 301166.

It is an arithmetic number, because the mean of its divisors is an integer number (253299150).

Almost surely, 2^6404039490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6404039490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8105572800).

6404039490 is an abundant number, since it is smaller than the sum of its proper divisors (9807106110).

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

6404039490 is a wasteful number, since it uses less digits than its factorization.

6404039490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22611.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 6404039490 is about 80025.2428299971. The cubic root of 6404039490 is about 1857.0260690351.

The spelling of 6404039490 in words is "six billion, four hundred four million, thirty-nine thousand, four hundred ninety".