40409523 has 120 divisors (see below), whose sum is σ = 82396160. Its totient is φ = 19245600.

The previous prime is 40409503. The next prime is 40409531. The reversal of 40409523 is 32590404.

40409523 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 40409523 - 2¹⁰ = 40408499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40409503) 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 119 ways as a sum of consecutive naturals, for example, 1303518 + ... + 1303548.

Almost surely, 2^40409523 is an apocalyptic number.

40409523 is an abundant number, since it is smaller than the sum of its proper divisors (41986637).

40409523 is a wasteful number, since it uses less digits than its factorization.

40409523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40409523 is about 6356.8485116447. The cubic root of 40409523 is about 343.1583529345.

Adding to 40409523 its reverse (32590404), we get a palindrome (72999927).

The spelling of 40409523 in words is "forty million, four hundred nine thousand, five hundred twenty-three".