649984 has 18 divisors (see below), whose sum is σ = 1297940. Its totient is φ = 324864.

The previous prime is 649981. The next prime is 649991. The reversal of 649984 is 489946.

It is not an unprimeable number, because it can be changed into a prime (649981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014 + ... + 1525.

2⁶⁴⁹⁹⁸⁴ is an apocalyptic number.

649984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

649984 is a deficient number, since it is larger than the sum of its proper divisors (647956).

649984 is an equidigital number, since it uses as much as digits as its factorization.

649984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555 (or 2541 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 649984 is about 806.2158519900. The cubic root of 649984 is about 86.6231997680.

The spelling of 649984 in words is "six hundred forty-nine thousand, nine hundred eighty-four".