649738 has 4 divisors (see below), whose sum is σ = 974610. Its totient is φ = 324868.

The previous prime is 649717. The next prime is 649739. The reversal of 649738 is 837946.

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., 431649 + 218089 = 657^2 + 467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 649697 and 649706.

It is not an unprimeable number, because it can be changed into a prime (649739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162433 + ... + 162436.

2⁶⁴⁹⁷³⁸ is an apocalyptic number.

649738 is a deficient number, since it is larger than the sum of its proper divisors (324872).

649738 is a wasteful number, since it uses less digits than its factorization.

649738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324871.

The product of its digits is 36288, while the sum is 37.

The square root of 649738 is about 806.0632729507. The cubic root of 649738 is about 86.6122702702.

The spelling of 649738 in words is "six hundred forty-nine thousand, seven hundred thirty-eight".