649787 has 2 divisors, whose sum is σ = 649788. Its totient is φ = 649786.

The previous prime is 649783. The next prime is 649793. The reversal of 649787 is 787946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649787 - 2² = 649783 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649787.

It is not a weakly prime, because it can be changed into another prime (649783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324893 + 324894.

It is an arithmetic number, because the mean of its divisors is an integer number (324894).

2⁶⁴⁹⁷⁸⁷ is an apocalyptic number.

649787 is a deficient number, since it is larger than the sum of its proper divisors (1).

649787 is an equidigital number, since it uses as much as digits as its factorization.

649787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 649787 is about 806.0936670140. The cubic root of 649787 is about 86.6144475040.

The spelling of 649787 in words is "six hundred forty-nine thousand, seven hundred eighty-seven".