648923 has 12 divisors (see below), whose sum is σ = 740544. Its totient is φ = 567600.

The previous prime is 648917. The next prime is 648931. The reversal of 648923 is 329846.

648923 = T₃₇ + T₃₈ + ... + T₁₅₇.

It is not a de Polignac number, because 648923 - 2⁶ = 648859 is a prime.

It is a super-2 number, since 2×648923² = 842202119858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648923.

It is not an unprimeable number, because it can be changed into a prime (648953) 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 11 ways as a sum of consecutive naturals, for example, 3665 + ... + 3837.

It is an arithmetic number, because the mean of its divisors is an integer number (61712).

2⁶⁴⁸⁹²³ is an apocalyptic number.

648923 is a deficient number, since it is larger than the sum of its proper divisors (91621).

648923 is a wasteful number, since it uses less digits than its factorization.

648923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 215 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 648923 is about 805.5575708787. The cubic root of 648923 is about 86.5760410335.

The spelling of 648923 in words is "six hundred forty-eight thousand, nine hundred twenty-three".