420024401 has 4 divisors (see below), whose sum is σ = 421586100. Its totient is φ = 418462704.

The previous prime is 420024379. The next prime is 420024439. The reversal of 420024401 is 104420024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67486225 + 352538176 = 8215^2 + 18776^2 .

It is a cyclic number.

It is not a de Polignac number, because 420024401 - 2⁶ = 420024337 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 420024401.

It is not an unprimeable number, because it can be changed into a prime (420024901) 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, 780446 + ... + 780983.

It is an arithmetic number, because the mean of its divisors is an integer number (105396525).

Almost surely, 2^420024401 is an apocalyptic number.

It is an amenable number.

420024401 is a deficient number, since it is larger than the sum of its proper divisors (1561699).

420024401 is a wasteful number, since it uses less digits than its factorization.

420024401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561698.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 420024401 is about 20494.4968467147. The cubic root of 420024401 is about 748.9017412962.

Adding to 420024401 its reverse (104420024), we get a palindrome (524444425).

The spelling of 420024401 in words is "four hundred twenty million, twenty-four thousand, four hundred one".