40647731 has 4 divisors (see below), whose sum is σ = 43038792. Its totient is φ = 38256672.

The previous prime is 40647709. The next prime is 40647743. The reversal of 40647731 is 13774604.

It is a happy number.

40647731 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 40647731 - 2⁶ = 40647667 is a prime.

It is a super-2 number, since 2×40647731² = 3304476070896722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40647331) 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, 1195505 + ... + 1195538.

It is an arithmetic number, because the mean of its divisors is an integer number (10759698).

Almost surely, 2^40647731 is an apocalyptic number.

40647731 is a deficient number, since it is larger than the sum of its proper divisors (2391061).

40647731 is a wasteful number, since it uses less digits than its factorization.

40647731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391060.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 40647731 is about 6375.5573089731. The cubic root of 40647731 is about 343.8313211019.

The spelling of 40647731 in words is "forty million, six hundred forty-seven thousand, seven hundred thirty-one".