420340420423 has 24 divisors (see below), whose sum is σ = 540726172560. Its totient is φ = 323051137920.

The previous prime is 420340420397. The next prime is 420340420439. The reversal of 420340420423 is 324024043024.

It is a happy number.

It is not a de Polignac number, because 420340420423 - 2⁵ = 420340420391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420340420391 and 420340420400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420340420463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5302108 + ... + 5380801.

It is an arithmetic number, because the mean of its divisors is an integer number (22530257190).

Almost surely, 2^420340420423 is an apocalyptic number.

420340420423 is a deficient number, since it is larger than the sum of its proper divisors (120385752137).

420340420423 is a wasteful number, since it uses less digits than its factorization.

420340420423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10683007 (or 10683000 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 420340420423 its reverse (324024043024), we get a palindrome (744364463447).

The spelling of 420340420423 in words is "four hundred twenty billion, three hundred forty million, four hundred twenty thousand, four hundred twenty-three".