40240531 has 4 divisors (see below), whose sum is σ = 40257112. Its totient is φ = 40223952.

The previous prime is 40240523. The next prime is 40240553. The reversal of 40240531 is 13504204.

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

It is a cyclic number.

It is not a de Polignac number, because 40240531 - 2³ = 40240523 is a prime.

It is a super-2 number, since 2×40240531² = 3238600670323922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40240499 and 40240508.

It is not an unprimeable number, because it can be changed into a prime (40240631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3861 + ... + 9766.

It is an arithmetic number, because the mean of its divisors is an integer number (10064278).

Almost surely, 2^40240531 is an apocalyptic number.

40240531 is a deficient number, since it is larger than the sum of its proper divisors (16581).

40240531 is a wasteful number, since it uses less digits than its factorization.

40240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16580.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40240531 is about 6343.5424645855. The cubic root of 40240531 is about 342.6793235739.

Adding to 40240531 its reverse (13504204), we get a palindrome (53744735).

The spelling of 40240531 in words is "forty million, two hundred forty thousand, five hundred thirty-one".