649742 has 4 divisors (see below), whose sum is σ = 974616. Its totient is φ = 324870.

The previous prime is 649739. The next prime is 649751. The reversal of 649742 is 247946.

649742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247946 = 2 ⋅123973.

It is a d-powerful number, because it can be written as 6⁵ + 4 + 7⁶ + 9 + 4² + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 649699 and 649708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162434 + ... + 162437.

It is an arithmetic number, because the mean of its divisors is an integer number (243654).

2⁶⁴⁹⁷⁴² is an apocalyptic number.

649742 is a deficient number, since it is larger than the sum of its proper divisors (324874).

649742 is a wasteful number, since it uses less digits than its factorization.

649742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324873.

The product of its digits is 12096, while the sum is 32.

The square root of 649742 is about 806.0657541417. The cubic root of 649742 is about 86.6124480077.

The spelling of 649742 in words is "six hundred forty-nine thousand, seven hundred forty-two".