649692 has 18 divisors (see below), whose sum is σ = 1642368. Its totient is φ = 216552.

The previous prime is 649661. The next prime is 649697. The reversal of 649692 is 296946.

649692 is a `hidden beast` number, since 649 + 6 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18047 = 649692 / (6 + 4 + 9 + 6 + 9 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649697) by changing a digit.

649692 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8988 + ... + 9059.

2⁶⁴⁹⁶⁹² is an apocalyptic number.

It is an amenable number.

649692 is an abundant number, since it is smaller than the sum of its proper divisors (992676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649692 is a wasteful number, since it uses less digits than its factorization.

649692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18057 (or 18052 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 649692 is about 806.0347387055. The cubic root of 649692 is about 86.6102262368.

The spelling of 649692 in words is "six hundred forty-nine thousand, six hundred ninety-two".