649383947 has 4 divisors (see below), whose sum is σ = 649786176. Its totient is φ = 648981720.

The previous prime is 649383941. The next prime is 649383967. The reversal of 649383947 is 749383946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749383946 = 2 ⋅374691973.

It is a cyclic number.

It is not a de Polignac number, because 649383947 - 2²⁴ = 632606731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649383941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198683 + ... + 201924.

It is an arithmetic number, because the mean of its divisors is an integer number (162446544).

Almost surely, 2^649383947 is an apocalyptic number.

649383947 is a deficient number, since it is larger than the sum of its proper divisors (402229).

649383947 is a wasteful number, since it uses less digits than its factorization.

649383947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402228.

The product of its digits is 3919104, while the sum is 53.

The square root of 649383947 is about 25483.0129105646. The cubic root of 649383947 is about 865.9653525813.

Subtracting 649383947 from its reverse (749383946), we obtain a palindrome (99999999).

The spelling of 649383947 in words is "six hundred forty-nine million, three hundred eighty-three thousand, nine hundred forty-seven".