40643751 has 16 divisors (see below), whose sum is σ = 56433888. Its totient is φ = 25996800.

The previous prime is 40643749. The next prime is 40643777. The reversal of 40643751 is 15734604.

40643751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40643751 - 2¹ = 40643749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4795 + ... + 10211.

It is an arithmetic number, because the mean of its divisors is an integer number (3527118).

Almost surely, 2^40643751 is an apocalyptic number.

40643751 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40643751 is a deficient number, since it is larger than the sum of its proper divisors (15790137).

40643751 is a wasteful number, since it uses less digits than its factorization.

40643751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5522.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 40643751 is about 6375.2451717561. The cubic root of 40643751 is about 343.8200987180.

The spelling of 40643751 in words is "forty million, six hundred forty-three thousand, seven hundred fifty-one".