40651 has 8 divisors (see below), whose sum is σ = 45360. Its totient is φ = 36192.

The previous prime is 40639. The next prime is 40693. The reversal of 40651 is 15604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40651 - 2¹¹ = 38603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40151) 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, 660 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (5670).

2⁴⁰⁶⁵¹ is an apocalyptic number.

40651 is a deficient number, since it is larger than the sum of its proper divisors (4709).

40651 is a wasteful number, since it uses less digits than its factorization.

40651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40651 is about 201.6209314531. The cubic root of 40651 is about 34.3840538135.

It can be divided in two parts, 406 and 51, that multiplied together give a triangular number (20706 = T₂₀₃).

The spelling of 40651 in words is "forty thousand, six hundred fifty-one".