40389531 has 32 divisors (see below), whose sum is σ = 66705408. Its totient is φ = 21168000.

The previous prime is 40389529. The next prime is 40389563. The reversal of 40389531 is 13598304.

40389531 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 40389531 - 2¹ = 40389529 is a prime.

It is a super-2 number, since 2×40389531² = 3262628428799922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40389492 and 40389501.

It is not an unprimeable number, because it can be changed into a prime (40389511) 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 31 ways as a sum of consecutive naturals, for example, 53406 + ... + 54156.

It is an arithmetic number, because the mean of its divisors is an integer number (2084544).

Almost surely, 2^40389531 is an apocalyptic number.

40389531 is a deficient number, since it is larger than the sum of its proper divisors (26315877).

40389531 is a wasteful number, since it uses less digits than its factorization.

40389531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 40389531 is about 6355.2758398043. The cubic root of 40389531 is about 343.1017527987.

The spelling of 40389531 in words is "forty million, three hundred eighty-nine thousand, five hundred thirty-one".