40040557 has 4 divisors (see below), whose sum is σ = 40080796. Its totient is φ = 40000320.

The previous prime is 40040551. The next prime is 40040563. The reversal of 40040557 is 75504004.

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

It is an interprime number because it is at equal distance from previous prime (40040551) and next prime (40040563).

It can be written as a sum of positive squares in 2 ways, for example, as 13682601 + 26357956 = 3699^2 + 5134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40040557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040551) 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, 18588 + ... + 20629.

It is an arithmetic number, because the mean of its divisors is an integer number (10020199).

Almost surely, 2^40040557 is an apocalyptic number.

It is an amenable number.

40040557 is a deficient number, since it is larger than the sum of its proper divisors (40239).

40040557 is a wasteful number, since it uses less digits than its factorization.

40040557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40238.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 40040557 is about 6327.7608203850. The cubic root of 40040557 is about 342.1107361163.

The spelling of 40040557 in words is "forty million, forty thousand, five hundred fifty-seven".