649421973 has 24 divisors (see below), whose sum is σ = 945984000. Its totient is φ = 429305184.

The previous prime is 649421953. The next prime is 649421987. The reversal of 649421973 is 379124946.

It is a happy number.

649421973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-649421973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649421933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 857511 + ... + 858267.

It is an arithmetic number, because the mean of its divisors is an integer number (39416000).

Almost surely, 2^649421973 is an apocalyptic number.

It is an amenable number.

649421973 is a deficient number, since it is larger than the sum of its proper divisors (296562027).

649421973 is a wasteful number, since it uses less digits than its factorization.

649421973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1438 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 649421973 is about 25483.7590045111. The cubic root of 649421973 is about 865.9822550398.

The spelling of 649421973 in words is "six hundred forty-nine million, four hundred twenty-one thousand, nine hundred seventy-three".