649542 has 16 divisors (see below), whose sum is σ = 1344240. Its totient is φ = 208992.

The previous prime is 649541. The next prime is 649559. The reversal of 649542 is 245946.

649542 is nontrivially palindromic in base 15.

649542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam 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 649542.

It is not an unprimeable number, because it can be changed into a prime (649541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1693 + ... + 2040.

It is an arithmetic number, because the mean of its divisors is an integer number (84015).

2⁶⁴⁹⁵⁴² is an apocalyptic number.

649542 is an abundant number, since it is smaller than the sum of its proper divisors (694698).

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

649542 is a wasteful number, since it uses less digits than its factorization.

649542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767.

The product of its digits is 8640, while the sum is 30.

The square root of 649542 is about 805.9416852354. The cubic root of 649542 is about 86.6035602403.

The spelling of 649542 in words is "six hundred forty-nine thousand, five hundred forty-two".