40408531 has 8 divisors (see below), whose sum is σ = 41805824. Its totient is φ = 39017160.

The previous prime is 40408523. The next prime is 40408547. The reversal of 40408531 is 13580404.

40408531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40408531 - 2³ = 40408523 is a prime.

It is a super-2 number, since 2×40408531² = 3265698755155922, 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 = 40408496 and 40408505.

It is not an unprimeable number, because it can be changed into a prime (40408591) 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 7 ways as a sum of consecutive naturals, for example, 15766 + ... + 18148.

It is an arithmetic number, because the mean of its divisors is an integer number (5225728).

Almost surely, 2^40408531 is an apocalyptic number.

40408531 is a deficient number, since it is larger than the sum of its proper divisors (1397293).

40408531 is a wasteful number, since it uses less digits than its factorization.

40408531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40408531 is about 6356.7704850812. The cubic root of 40408531 is about 343.1555448846.

Adding to 40408531 its reverse (13580404), we get a palindrome (53988935).

The spelling of 40408531 in words is "forty million, four hundred eight thousand, five hundred thirty-one".