40831509 has 32 divisors (see below), whose sum is σ = 58924800. Its totient is φ = 25090560.

The previous prime is 40831493. The next prime is 40831537. The reversal of 40831509 is 90513804.

It is not a de Polignac number, because 40831509 - 2⁴ = 40831493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40831559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374547 + ... + 374655.

It is an arithmetic number, because the mean of its divisors is an integer number (1841400).

Almost surely, 2^40831509 is an apocalyptic number.

It is an amenable number.

40831509 is a deficient number, since it is larger than the sum of its proper divisors (18093291).

40831509 is a wasteful number, since it uses less digits than its factorization.

40831509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 40831509 is about 6389.9537557012. The cubic root of 40831509 is about 344.3487230102.

The spelling of 40831509 in words is "forty million, eight hundred thirty-one thousand, five hundred nine".