647493 has 16 divisors (see below), whose sum is σ = 1076736. Its totient is φ = 336240.

The previous prime is 647489. The next prime is 647503. The reversal of 647493 is 394746.

It is not a de Polignac number, because 647493 - 2² = 647489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

647493 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647453) 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, 1171 + ... + 1632.

It is an arithmetic number, because the mean of its divisors is an integer number (67296).

2⁶⁴⁷⁴⁹³ is an apocalyptic number.

It is an amenable number.

647493 is a deficient number, since it is larger than the sum of its proper divisors (429243).

647493 is a wasteful number, since it uses less digits than its factorization.

647493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824.

The product of its digits is 18144, while the sum is 33.

The square root of 647493 is about 804.6694973714. The cubic root of 647493 is about 86.5123997950.

It can be divided in two parts, 64 and 7493, that added together give a palindrome (7557).

The spelling of 647493 in words is "six hundred forty-seven thousand, four hundred ninety-three".