403521423 has 4 divisors (see below), whose sum is σ = 538028568. Its totient is φ = 269014280.

The previous prime is 403521413. The next prime is 403521427. The reversal of 403521423 is 324125304.

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 403521423 - 2¹⁰ = 403520399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 403521393 and 403521402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403521427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67253568 + ... + 67253573.

It is an arithmetic number, because the mean of its divisors is an integer number (134507142).

Almost surely, 2^403521423 is an apocalyptic number.

403521423 is a deficient number, since it is larger than the sum of its proper divisors (134507145).

403521423 is a wasteful number, since it uses less digits than its factorization.

403521423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134507144.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 403521423 is about 20087.8426666479. The cubic root of 403521423 is about 738.9621578522.

Adding to 403521423 its reverse (324125304), we get a palindrome (727646727).

The spelling of 403521423 in words is "four hundred three million, five hundred twenty-one thousand, four hundred twenty-three".