649958 has 4 divisors (see below), whose sum is σ = 974940. Its totient is φ = 324978.

The previous prime is 649937. The next prime is 649969. The reversal of 649958 is 859946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 859946 = 2 ⋅429973.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649958.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162488 + ... + 162491.

It is an arithmetic number, because the mean of its divisors is an integer number (243735).

2⁶⁴⁹⁹⁵⁸ is an apocalyptic number.

649958 is a deficient number, since it is larger than the sum of its proper divisors (324982).

649958 is a wasteful number, since it uses less digits than its factorization.

649958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324981.

The product of its digits is 77760, while the sum is 41.

The square root of 649958 is about 806.1997271148. The cubic root of 649958 is about 86.6220447481.

The spelling of 649958 in words is "six hundred forty-nine thousand, nine hundred fifty-eight".