649843799 has 8 divisors (see below), whose sum is σ = 709285248. Its totient is φ = 590463160.

The previous prime is 649843783. The next prime is 649843801. The reversal of 649843799 is 997348946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649843799 - 2⁴ = 649843783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649843739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8804 + ... + 37110.

It is an arithmetic number, because the mean of its divisors is an integer number (88660656).

Almost surely, 2^649843799 is an apocalyptic number.

649843799 is a deficient number, since it is larger than the sum of its proper divisors (59441449).

649843799 is a wasteful number, since it uses less digits than its factorization.

649843799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30405.

The product of its digits is 11757312, while the sum is 59.

The square root of 649843799 is about 25492.0340302613. The cubic root of 649843799 is about 866.1697113642.

It can be divided in two parts, 649 and 843799, that added together give a palindrome (844448).

The spelling of 649843799 in words is "six hundred forty-nine million, eight hundred forty-three thousand, seven hundred ninety-nine".