647497 has 4 divisors (see below), whose sum is σ = 668416. Its totient is φ = 626580.

The previous prime is 647489. The next prime is 647503. The reversal of 647497 is 794746.

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, and also an emirpimes, since its reverse is a distinct semiprime: 794746 = 2 ⋅397373.

It is a cyclic number.

It is not a de Polignac number, because 647497 - 2³ = 647489 is a prime.

It is a Duffinian number.

647497 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (647417) 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, 10413 + ... + 10474.

It is an arithmetic number, because the mean of its divisors is an integer number (167104).

2⁶⁴⁷⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

647497 is a deficient number, since it is larger than the sum of its proper divisors (20919).

647497 is a wasteful number, since it uses less digits than its factorization.

647497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20918.

The product of its digits is 42336, while the sum is 37.

The square root of 647497 is about 804.6719828601. The cubic root of 647497 is about 86.5125779431.

The spelling of 647497 in words is "six hundred forty-seven thousand, four hundred ninety-seven".