6400473839 has 4 divisors (see below), whose sum is σ = 6401795400. Its totient is φ = 6399152280.

The previous prime is 6400473809. The next prime is 6400473841. The reversal of 6400473839 is 9383740046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6400473839 - 2¹² = 6400469743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400473839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400473809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653489 + ... + 663210.

It is an arithmetic number, because the mean of its divisors is an integer number (1600448850).

Almost surely, 2^6400473839 is an apocalyptic number.

6400473839 is a deficient number, since it is larger than the sum of its proper divisors (1321561).

6400473839 is a wasteful number, since it uses less digits than its factorization.

6400473839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321560.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 6400473839 is about 80002.9614389367. The cubic root of 6400473839 is about 1856.6813524354.

The spelling of 6400473839 in words is "six billion, four hundred million, four hundred seventy-three thousand, eight hundred thirty-nine".