649747946 has 4 divisors (see below), whose sum is σ = 974621922. Its totient is φ = 324873972.

The previous prime is 649747913. The next prime is 649747949.

649747946 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 536431921 + 113316025 = 23161^2 + 10645^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 649747891 and 649747900.

It is not an unprimeable number, because it can be changed into a prime (649747949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162436985 + ... + 162436988.

Almost surely, 2^649747946 is an apocalyptic number.

649747946 is a deficient number, since it is larger than the sum of its proper divisors (324873976).

649747946 is a wasteful number, since it uses less digits than its factorization.

649747946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324873975.

The product of its digits is 9144576, while the sum is 56.

The square root of 649747946 is about 25490.1539030269. The cubic root of 649747946 is about 866.1271221308.

The spelling of 649747946 in words is "six hundred forty-nine million, seven hundred forty-seven thousand, nine hundred forty-six".