649837 has 4 divisors (see below), whose sum is σ = 652860. Its totient is φ = 646816.

The previous prime is 649829. The next prime is 649843. The reversal of 649837 is 738946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 385641 = 514^2 + 621^2 .

It is a cyclic number.

It is not a de Polignac number, because 649837 - 2³ = 649829 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6 + 4 + 8 + 9³ + 3¹² + 7⁶ .

It is a Duffinian number.

649837 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 649796 and 649805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162 + ... + 1627.

It is an arithmetic number, because the mean of its divisors is an integer number (163215).

2⁶⁴⁹⁸³⁷ is an apocalyptic number.

It is an amenable number.

649837 is a deficient number, since it is larger than the sum of its proper divisors (3023).

649837 is a wasteful number, since it uses less digits than its factorization.

649837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022.

The product of its digits is 36288, while the sum is 37.

The square root of 649837 is about 806.1246801829. The cubic root of 649837 is about 86.6166690583.

The spelling of 649837 in words is "six hundred forty-nine thousand, eight hundred thirty-seven".