40238857 has 4 divisors (see below), whose sum is σ = 40255380. Its totient is φ = 40222336.

The previous prime is 40238843. The next prime is 40238879. The reversal of 40238857 is 75883204.

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 12138256 + 28100601 = 3484^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 40238857 - 2¹⁹ = 39714569 is a prime.

It is a super-2 number, since 2×40238857² = 3238331225332898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40238897) 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, 3808 + ... + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (10063845).

Almost surely, 2^40238857 is an apocalyptic number.

It is an amenable number.

40238857 is a deficient number, since it is larger than the sum of its proper divisors (16523).

40238857 is a wasteful number, since it uses less digits than its factorization.

40238857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16522.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 40238857 is about 6343.4105180100. The cubic root of 40238857 is about 342.6745717053.

It can be divided in two parts, 4023 and 8857, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 40238857 in words is "forty million, two hundred thirty-eight thousand, eight hundred fifty-seven".