403424421 has 16 divisors (see below), whose sum is σ = 557334528. Its totient is φ = 259297200.

The previous prime is 403424389. The next prime is 403424443. The reversal of 403424421 is 124424304.

It is a happy number.

It is not a de Polignac number, because 403424421 - 2⁵ = 403424389 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 403424391 and 403424400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403424521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17200 + ... + 33206.

It is an arithmetic number, because the mean of its divisors is an integer number (34833408).

Almost surely, 2^403424421 is an apocalyptic number.

It is an amenable number.

403424421 is a deficient number, since it is larger than the sum of its proper divisors (153910107).

403424421 is a wasteful number, since it uses less digits than its factorization.

403424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16312.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 403424421 is about 20085.4280760954. The cubic root of 403424421 is about 738.9029403835.

Adding to 403424421 its reverse (124424304), we get a palindrome (527848725).

The spelling of 403424421 in words is "four hundred three million, four hundred twenty-four thousand, four hundred twenty-one".