640092 has 24 divisors (see below), whose sum is σ = 1531152. Its totient is φ = 208000.

The previous prime is 640069. The next prime is 640099. The reversal of 640092 is 290046.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640092.

It is not an unprimeable number, because it can be changed into a prime (640099) by changing a digit.

640092 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159 + ... + 1142.

It is an arithmetic number, because the mean of its divisors is an integer number (63798).

2⁶⁴⁰⁰⁹² is an apocalyptic number.

It is an amenable number.

640092 is an abundant number, since it is smaller than the sum of its proper divisors (891060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640092 is a wasteful number, since it uses less digits than its factorization.

640092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 640092 is about 800.0574979337. The cubic root of 640092 is about 86.1815167366.

The spelling of 640092 in words is "six hundred forty thousand, ninety-two".