40042357 has 4 divisors (see below), whose sum is σ = 40055020. Its totient is φ = 40029696.

The previous prime is 40042351. The next prime is 40042369. The reversal of 40042357 is 75324004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22410756 + 17631601 = 4734^2 + 4199^2 .

It is a cyclic number.

It is not a de Polignac number, because 40042357 - 2⁷ = 40042229 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 (40042351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2869 + ... + 9397.

It is an arithmetic number, because the mean of its divisors is an integer number (10013755).

Almost surely, 2^40042357 is an apocalyptic number.

It is an amenable number.

40042357 is a deficient number, since it is larger than the sum of its proper divisors (12663).

40042357 is an equidigital number, since it uses as much as digits as its factorization.

40042357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12662.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 40042357 is about 6327.9030491941. The cubic root of 40042357 is about 342.1158625027.

The spelling of 40042357 in words is "forty million, forty-two thousand, three hundred fifty-seven".