40857644 has 6 divisors (see below), whose sum is σ = 71500884. Its totient is φ = 20428820.

The previous prime is 40857643. The next prime is 40857667. The reversal of 40857644 is 44675804.

40857644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 40857598 and 40857607.

It is not an unprimeable number, because it can be changed into a prime (40857643) 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 as a sum of consecutive naturals, namely, 5107202 + ... + 5107209.

It is an arithmetic number, because the mean of its divisors is an integer number (11916814).

Almost surely, 2^40857644 is an apocalyptic number.

It is an amenable number.

40857644 is a deficient number, since it is larger than the sum of its proper divisors (30643240).

40857644 is a wasteful number, since it uses less digits than its factorization.

40857644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10214415 (or 10214413 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 40857644 is about 6391.9984355442. The cubic root of 40857644 is about 344.4221763690.

The spelling of 40857644 in words is "forty million, eight hundred fifty-seven thousand, six hundred forty-four".