40209257 has 8 divisors (see below), whose sum is σ = 44885280. Its totient is φ = 35703360.

The previous prime is 40209251. The next prime is 40209293. The reversal of 40209257 is 75290204.

40209257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40209257 - 2⁴ = 40209241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40209251) 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 7 ways as a sum of consecutive naturals, for example, 42032 + ... + 42977.

It is an arithmetic number, because the mean of its divisors is an integer number (5610660).

Almost surely, 2^40209257 is an apocalyptic number.

It is an amenable number.

40209257 is a deficient number, since it is larger than the sum of its proper divisors (4676023).

40209257 is a wasteful number, since it uses less digits than its factorization.

40209257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85063.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 40209257 is about 6341.0769590031. The cubic root of 40209257 is about 342.5905264464.

The spelling of 40209257 in words is "forty million, two hundred nine thousand, two hundred fifty-seven".