649995 has 16 divisors (see below), whose sum is σ = 1101600. Its totient is φ = 326144.

The previous prime is 649991. The next prime is 650011. The reversal of 649995 is 599946.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 649995 - 2² = 649991 is a prime.

649995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (649991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020 + ... + 1529.

It is an arithmetic number, because the mean of its divisors is an integer number (68850).

2⁶⁴⁹⁹⁹⁵ is an apocalyptic number.

649995 is a deficient number, since it is larger than the sum of its proper divisors (451605).

649995 is a wasteful number, since it uses less digits than its factorization.

649995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574.

The product of its digits is 87480, while the sum is 42.

The square root of 649995 is about 806.2226739555. Note that the first 3 decimals coincide. The cubic root of 649995 is about 86.6236884209.

The spelling of 649995 in words is "six hundred forty-nine thousand, nine hundred ninety-five".