649894 has 16 divisors (see below), whose sum is σ = 1133856. Its totient is φ = 273600.

The previous prime is 649879. The next prime is 649897. The reversal of 649894 is 498946.

It is a super-2 number, since 2×649894² = 844724422472, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649897) 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 7 ways as a sum of consecutive naturals, for example, 474 + ... + 1234.

It is an arithmetic number, because the mean of its divisors is an integer number (70866).

2⁶⁴⁹⁸⁹⁴ is an apocalyptic number.

649894 is a deficient number, since it is larger than the sum of its proper divisors (483962).

649894 is a wasteful number, since it uses less digits than its factorization.

649894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831.

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

The square root of 649894 is about 806.1600337402. The cubic root of 649894 is about 86.6192014912.

The spelling of 649894 in words is "six hundred forty-nine thousand, eight hundred ninety-four".