40040857 has 4 divisors (see below), whose sum is σ = 40196916. Its totient is φ = 39884800.

The previous prime is 40040849. The next prime is 40040867. The reversal of 40040857 is 75804004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24760576 + 15280281 = 4976^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 40040857 - 2³ = 40040849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40040807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77644 + ... + 78157.

It is an arithmetic number, because the mean of its divisors is an integer number (10049229).

Almost surely, 2^40040857 is an apocalyptic number.

It is an amenable number.

40040857 is a deficient number, since it is larger than the sum of its proper divisors (156059).

40040857 is a wasteful number, since it uses less digits than its factorization.

40040857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156058.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 40040857 is about 6327.7845254086. The cubic root of 40040857 is about 342.1115905247. Note that the first 3 decimals are identical.

The spelling of 40040857 in words is "forty million, forty thousand, eight hundred fifty-seven".