40421523 has 4 divisors (see below), whose sum is σ = 53895368. Its totient is φ = 26947680.

The previous prime is 40421519. The next prime is 40421533. The reversal of 40421523 is 32512404.

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

It is not a de Polignac number, because 40421523 - 2² = 40421519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40421523.

It is not an unprimeable number, because it can be changed into a prime (40421503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6736918 + ... + 6736923.

It is an arithmetic number, because the mean of its divisors is an integer number (13473842).

Almost surely, 2^40421523 is an apocalyptic number.

40421523 is a deficient number, since it is larger than the sum of its proper divisors (13473845).

40421523 is a wasteful number, since it uses less digits than its factorization.

40421523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13473844.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40421523 is about 6357.7923055098. The cubic root of 40421523 is about 343.1923176404.

Adding to 40421523 its reverse (32512404), we get a palindrome (72933927).

It can be divided in two parts, 4042 and 1523, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 40421523 in words is "forty million, four hundred twenty-one thousand, five hundred twenty-three".