420432123 has 4 divisors (see below), whose sum is σ = 560576168. Its totient is φ = 280288080.

The previous prime is 420432121. The next prime is 420432127. The reversal of 420432123 is 321234024.

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

It is not a de Polignac number, because 420432123 - 2¹ = 420432121 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 420432123.

It is not an unprimeable number, because it can be changed into a prime (420432121) 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, 70072018 + ... + 70072023.

It is an arithmetic number, because the mean of its divisors is an integer number (140144042).

Almost surely, 2^420432123 is an apocalyptic number.

420432123 is a deficient number, since it is larger than the sum of its proper divisors (140144045).

420432123 is a wasteful number, since it uses less digits than its factorization.

420432123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140144044.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 420432123 is about 20504.4415432364. The cubic root of 420432123 is about 749.1439851342.

Adding to 420432123 its reverse (321234024), we get a palindrome (741666147).

The spelling of 420432123 in words is "four hundred twenty million, four hundred thirty-two thousand, one hundred twenty-three".