423621455 has 4 divisors (see below), whose sum is σ = 508345752. Its totient is φ = 338897160.

The previous prime is 423621439. The next prime is 423621491. The reversal of 423621455 is 554126324.

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

It is not a de Polignac number, because 423621455 - 2⁴ = 423621439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42362141 + ... + 42362150.

It is an arithmetic number, because the mean of its divisors is an integer number (127086438).

Almost surely, 2^423621455 is an apocalyptic number.

423621455 is a deficient number, since it is larger than the sum of its proper divisors (84724297).

423621455 is an equidigital number, since it uses as much as digits as its factorization.

423621455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84724296.

The product of its digits is 28800, while the sum is 32.

The square root of 423621455 is about 20582.0663442717. The cubic root of 423621455 is about 751.0335114476.

Adding to 423621455 its reverse (554126324), we get a palindrome (977747779).

The spelling of 423621455 in words is "four hundred twenty-three million, six hundred twenty-one thousand, four hundred fifty-five".