649994 has 4 divisors (see below), whose sum is σ = 974994. Its totient is φ = 324996.

The previous prime is 649991. The next prime is 650011. The reversal of 649994 is 499946.

649994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499946 = 2 ⋅249973.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 30625 = 787^2 + 175^2 .

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649994.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162497 + ... + 162500.

2⁶⁴⁹⁹⁹⁴ is an apocalyptic number.

649994 is a deficient number, since it is larger than the sum of its proper divisors (325000).

649994 is a wasteful number, since it uses less digits than its factorization.

649994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324999.

The product of its digits is 69984, while the sum is 41.

The square root of 649994 is about 806.2220537792. Note that the first 3 decimals coincide. The cubic root of 649994 is about 86.6236439982.

The spelling of 649994 in words is "six hundred forty-nine thousand, nine hundred ninety-four".