650749 has 4 divisors (see below), whose sum is σ = 709920. Its totient is φ = 591580.

The previous prime is 650701. The next prime is 650759. The reversal of 650749 is 947056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 650749 - 2¹³ = 642557 is a prime.

It is a super-2 number, since 2×650749² = 846948522002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

650749 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 650749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650759) 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, 29569 + ... + 29590.

It is an arithmetic number, because the mean of its divisors is an integer number (177480).

2⁶⁵⁰⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

650749 is a deficient number, since it is larger than the sum of its proper divisors (59171).

650749 is a wasteful number, since it uses less digits than its factorization.

650749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59170.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 650749 is about 806.6901511733. The cubic root of 650749 is about 86.6571702284.

It can be divided in two parts, 6507 and 49, that added together give a palindrome (6556).

The spelling of 650749 in words is "six hundred fifty thousand, seven hundred forty-nine".