649699 has 4 divisors (see below), whose sum is σ = 659464. Its totient is φ = 639936.

The previous prime is 649697. The next prime is 649709. The reversal of 649699 is 996946.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 649699 - 2¹ = 649697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649697) 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, 4782 + ... + 4915.

It is an arithmetic number, because the mean of its divisors is an integer number (164866).

2⁶⁴⁹⁶⁹⁹ is an apocalyptic number.

649699 is a deficient number, since it is larger than the sum of its proper divisors (9765).

649699 is an equidigital number, since it uses as much as digits as its factorization.

649699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764.

The product of its digits is 104976, while the sum is 43.

The square root of 649699 is about 806.0390809384. The cubic root of 649699 is about 86.6105372916.

The spelling of 649699 in words is "six hundred forty-nine thousand, six hundred ninety-nine".