648947 has 4 divisors (see below), whose sum is σ = 698880. Its totient is φ = 599016.

The previous prime is 648937. The next prime is 648953. The reversal of 648947 is 749846.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 648947 - 2⁴ = 648931 is a prime.

It is a super-2 number, since 2×648947² = 842264417618, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 648947.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648947.

It is not an unprimeable number, because it can be changed into a prime (648917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24947 + ... + 24972.

It is an arithmetic number, because the mean of its divisors is an integer number (174720).

2⁶⁴⁸⁹⁴⁷ is an apocalyptic number.

648947 is a deficient number, since it is larger than the sum of its proper divisors (49933).

648947 is a wasteful number, since it uses less digits than its factorization.

648947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49932.

The product of its digits is 48384, while the sum is 38.

The square root of 648947 is about 805.5724672554. The cubic root of 648947 is about 86.5771083401.

The spelling of 648947 in words is "six hundred forty-eight thousand, nine hundred forty-seven".