40309857 has 12 divisors (see below), whose sum is σ = 66543360. Its totient is φ = 23034168.

The previous prime is 40309853. The next prime is 40309883. The reversal of 40309857 is 75890304.

It is not a de Polignac number, because 40309857 - 2² = 40309853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40309853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319857 + ... + 319982.

It is an arithmetic number, because the mean of its divisors is an integer number (5545280).

Almost surely, 2^40309857 is an apocalyptic number.

It is an amenable number.

40309857 is a deficient number, since it is larger than the sum of its proper divisors (26233503).

40309857 is a wasteful number, since it uses less digits than its factorization.

40309857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639852 (or 639849 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 40309857 is about 6349.0044101418. The cubic root of 40309857 is about 342.8759988886.

The spelling of 40309857 in words is "forty million, three hundred nine thousand, eight hundred fifty-seven".