40640887 has 4 divisors (see below), whose sum is σ = 46446736. Its totient is φ = 34835040.

The previous prime is 40640879. The next prime is 40640909. The reversal of 40640887 is 78804604.

40640887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 40640887 - 2³ = 40640879 is a prime.

It is a super-2 number, since 2×40640887² = 3303363392293538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640827) 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 3 ways as a sum of consecutive naturals, for example, 2902914 + ... + 2902927.

It is an arithmetic number, because the mean of its divisors is an integer number (11611684).

Almost surely, 2^40640887 is an apocalyptic number.

40640887 is a deficient number, since it is larger than the sum of its proper divisors (5805849).

40640887 is an equidigital number, since it uses as much as digits as its factorization.

40640887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805848.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 40640887 is about 6375.0205489865. The cubic root of 40640887 is about 343.8120226598.

The spelling of 40640887 in words is "forty million, six hundred forty thousand, eight hundred eighty-seven".