40643753 has 4 divisors (see below), whose sum is σ = 43034580. Its totient is φ = 38252928.

The previous prime is 40643749. The next prime is 40643777. The reversal of 40643753 is 35734604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12902464 + 27741289 = 3592^2 + 5267^2 .

It is a cyclic number.

It is not a de Polignac number, because 40643753 - 2² = 40643749 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40603753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195388 + ... + 1195421.

It is an arithmetic number, because the mean of its divisors is an integer number (10758645).

Almost surely, 2^40643753 is an apocalyptic number.

It is an amenable number.

40643753 is a deficient number, since it is larger than the sum of its proper divisors (2390827).

40643753 is a wasteful number, since it uses less digits than its factorization.

40643753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390826.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 40643753 is about 6375.2453286129. The cubic root of 40643753 is about 343.8201043576.

The spelling of 40643753 in words is "forty million, six hundred forty-three thousand, seven hundred fifty-three".