649899 has 6 divisors (see below), whose sum is σ = 938756. Its totient is φ = 433260.

The previous prime is 649897. The next prime is 649907. The reversal of 649899 is 998946.

It is not a de Polignac number, because 649899 - 2¹ = 649897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36097 + ... + 36114.

2⁶⁴⁹⁸⁹⁹ is an apocalyptic number.

649899 is a deficient number, since it is larger than the sum of its proper divisors (288857).

649899 is a wasteful number, since it uses less digits than its factorization.

649899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72217 (or 72214 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 649899 is about 806.1631348555. The cubic root of 649899 is about 86.6194236273.

The spelling of 649899 in words is "six hundred forty-nine thousand, eight hundred ninety-nine".