6440460838 has 16 divisors (see below), whose sum is σ = 11147984640. Its totient is φ = 2733398856.

The previous prime is 6440460811. The next prime is 6440460883. The reversal of 6440460838 is 8380640446.

It is a junction number, because it is equal to n+sod(n) for n = 6440460794 and 6440460803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2231728 + ... + 2234611.

It is an arithmetic number, because the mean of its divisors is an integer number (696749040).

Almost surely, 2^6440460838 is an apocalyptic number.

6440460838 is a deficient number, since it is larger than the sum of its proper divisors (4707523802).

6440460838 is a wasteful number, since it uses less digits than its factorization.

6440460838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466451.

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 6440460838 is about 80252.4818183214. The cubic root of 6440460838 is about 1860.5398708418.

The spelling of 6440460838 in words is "six billion, four hundred forty million, four hundred sixty thousand, eight hundred thirty-eight".