649807 has 4 divisors (see below), whose sum is σ = 657720. Its totient is φ = 641896.

The previous prime is 649801. The next prime is 649813. The reversal of 649807 is 708946.

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

It is an interprime number because it is at equal distance from previous prime (649801) and next prime (649813).

It is a cyclic number.

It is not a de Polignac number, because 649807 - 2³ = 649799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3832 + ... + 3997.

It is an arithmetic number, because the mean of its divisors is an integer number (164430).

2⁶⁴⁹⁸⁰⁷ is an apocalyptic number.

649807 is a deficient number, since it is larger than the sum of its proper divisors (7913).

649807 is an equidigital number, since it uses as much as digits as its factorization.

649807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 649807 is about 806.1060724247. The cubic root of 649807 is about 86.6153361394.

The spelling of 649807 in words is "six hundred forty-nine thousand, eight hundred seven".