40002531 has 16 divisors (see below), whose sum is σ = 54568320. Its totient is φ = 26058240.

The previous prime is 40002491. The next prime is 40002559. The reversal of 40002531 is 13520004.

40002531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40002531 - 2¹⁴ = 39986147 is a prime.

It is a super-2 number, since 2×40002531² = 3200404972811922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40002531.

It is not an unprimeable number, because it can be changed into a prime (40002731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33576 + ... + 34746.

It is an arithmetic number, because the mean of its divisors is an integer number (3410520).

Almost surely, 2^40002531 is an apocalyptic number.

40002531 is a deficient number, since it is larger than the sum of its proper divisors (14565789).

40002531 is a wasteful number, since it uses less digits than its factorization.

40002531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 40002531 is about 6324.7554102906. The cubic root of 40002531 is about 342.0024024317.

Adding to 40002531 its reverse (13520004), we get a palindrome (53522535).

The spelling of 40002531 in words is "forty million, two thousand, five hundred thirty-one".