649957 has 16 divisors (see below), whose sum is σ = 847872. Its totient is φ = 483120.

The previous prime is 649937. The next prime is 649969. The reversal of 649957 is 759946.

It is not a de Polignac number, because 649957 - 2⁷ = 649829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1588 + ... + 1954.

It is an arithmetic number, because the mean of its divisors is an integer number (52992).

2⁶⁴⁹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

649957 is a deficient number, since it is larger than the sum of its proper divisors (197915).

649957 is a wasteful number, since it uses less digits than its factorization.

649957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its digits is 68040, while the sum is 40.

The square root of 649957 is about 806.1991069209. The cubic root of 649957 is about 86.6220003237.

It can be divided in two parts, 6499 and 57, that added together give a palindrome (6556).

The spelling of 649957 in words is "six hundred forty-nine thousand, nine hundred fifty-seven".