40342523 has 4 divisors (see below), whose sum is σ = 43445808. Its totient is φ = 37239240.

The previous prime is 40342481. The next prime is 40342537. The reversal of 40342523 is 32524304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40342523 - 2¹⁸ = 40080379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40342553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551623 + ... + 1551648.

It is an arithmetic number, because the mean of its divisors is an integer number (10861452).

Almost surely, 2^40342523 is an apocalyptic number.

40342523 is a deficient number, since it is larger than the sum of its proper divisors (3103285).

40342523 is a wasteful number, since it uses less digits than its factorization.

40342523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3103284.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 40342523 is about 6351.5764184964. The cubic root of 40342523 is about 342.9685929758.

Adding to 40342523 its reverse (32524304), we get a palindrome (72866827).

The spelling of 40342523 in words is "forty million, three hundred forty-two thousand, five hundred twenty-three".