40653 has 6 divisors (see below), whose sum is σ = 58734. Its totient is φ = 27096.

The previous prime is 40639. The next prime is 40693. The reversal of 40653 is 35604.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21609 + 19044 = 147^2 + 138^2 .

It is not a de Polignac number, because 40653 - 2⁴ = 40637 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2250 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (9789).

2⁴⁰⁶⁵³ is an apocalyptic number.

It is an amenable number.

40653 is a deficient number, since it is larger than the sum of its proper divisors (18081).

40653 is a wasteful number, since it uses less digits than its factorization.

40653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523 (or 4520 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 40653 is about 201.6258911946. The cubic root of 40653 is about 34.3846176945.

The spelling of 40653 in words is "forty thousand, six hundred fifty-three".