404421523 has 8 divisors (see below), whose sum is σ = 442215936. Its totient is φ = 366798600.

The previous prime is 404421509. The next prime is 404421529. The reversal of 404421523 is 325124404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404421523 - 2¹⁷ = 404290451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404421529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37911 + ... + 47392.

It is an arithmetic number, because the mean of its divisors is an integer number (55276992).

Almost surely, 2^404421523 is an apocalyptic number.

404421523 is a deficient number, since it is larger than the sum of its proper divisors (37794413).

404421523 is a wasteful number, since it uses less digits than its factorization.

404421523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85745.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 404421523 is about 20110.2342850599. The cubic root of 404421523 is about 739.5111959420.

Adding to 404421523 its reverse (325124404), we get a palindrome (729545927).

The spelling of 404421523 in words is "four hundred four million, four hundred twenty-one thousand, five hundred twenty-three".