653992 has 8 divisors (see below), whose sum is σ = 1226250. Its totient is φ = 326992.

The previous prime is 653977. The next prime is 653993. The reversal of 653992 is 299356.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 4356 = 806^2 + 66^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 6⁴ + 5⁵ + 9⁵ + 3¹² + 9⁵ + 2⁵ .

It is not an unprimeable number, because it can be changed into a prime (653993) by changing a digit.

653992 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40867 + ... + 40882.

2⁶⁵³⁹⁹² is an apocalyptic number.

It is an amenable number.

653992 is a deficient number, since it is larger than the sum of its proper divisors (572258).

653992 is a wasteful number, since it uses less digits than its factorization.

653992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81755 (or 81751 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 653992 is about 808.6977185574. The cubic root of 653992 is about 86.8008834245.

The spelling of 653992 in words is "six hundred fifty-three thousand, nine hundred ninety-two".