640094 has 16 divisors (see below), whose sum is σ = 1182048. Its totient is φ = 253152.

The previous prime is 640069. The next prime is 640099. The reversal of 640094 is 490046.

640094 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 640094.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577 + ... + 1940.

It is an arithmetic number, because the mean of its divisors is an integer number (73878).

2⁶⁴⁰⁰⁹⁴ is an apocalyptic number.

640094 is a deficient number, since it is larger than the sum of its proper divisors (541954).

640094 is a wasteful number, since it uses less digits than its factorization.

640094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 640094 is about 800.0587478429. The cubic root of 640094 is about 86.1816064960.

It can be divided in two parts, 64009 and 4, that multiplied together give a square (256036 = 506²).

The spelling of 640094 in words is "six hundred forty thousand, ninety-four".