40654 has 4 divisors (see below), whose sum is σ = 60984. Its totient is φ = 20326.

The previous prime is 40639. The next prime is 40693. The reversal of 40654 is 45604.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

40654 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 as a sum of consecutive naturals, namely, 10162 + ... + 10165.

It is an arithmetic number, because the mean of its divisors is an integer number (15246).

2⁴⁰⁶⁵⁴ is an apocalyptic number.

40654 is a deficient number, since it is larger than the sum of its proper divisors (20330).

40654 is a wasteful number, since it uses less digits than its factorization.

40654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20329.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40654 is about 201.6283710196. The cubic root of 40654 is about 34.3848996281.

Subtracting 40654 from its reverse (45604), we obtain a triangular number (4950 = T₉₉).

The spelling of 40654 in words is "forty thousand, six hundred fifty-four".