420161023 has 4 divisors (see below), whose sum is σ = 425223288. Its totient is φ = 415098760.

The previous prime is 420161017. The next prime is 420161039. The reversal of 420161023 is 320161024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420161023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420161083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531008 + ... + 2531173.

It is an arithmetic number, because the mean of its divisors is an integer number (106305822).

Almost surely, 2^420161023 is an apocalyptic number.

420161023 is a deficient number, since it is larger than the sum of its proper divisors (5062265).

420161023 is an equidigital number, since it uses as much as digits as its factorization.

420161023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062264.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 420161023 is about 20497.8297143868. The cubic root of 420161023 is about 748.9829313111.

Subtracting from 420161023 its reverse (320161024), we obtain a palindrome (99999999).

The spelling of 420161023 in words is "four hundred twenty million, one hundred sixty-one thousand, twenty-three".