420018861 has 16 divisors (see below), whose sum is σ = 582825600. Its totient is φ = 268728768.

The previous prime is 420018829. The next prime is 420018877. The reversal of 420018861 is 168810024.

It is not a de Polignac number, because 420018861 - 2⁵ = 420018829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420018821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75 + ... + 28983.

It is an arithmetic number, because the mean of its divisors is an integer number (36426600).

Almost surely, 2^420018861 is an apocalyptic number.

It is an amenable number.

420018861 is a deficient number, since it is larger than the sum of its proper divisors (162806739).

420018861 is a wasteful number, since it uses less digits than its factorization.

420018861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29108.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 420018861 is about 20494.3616880351. The cubic root of 420018861 is about 748.8984486828.

Adding to 420018861 its reverse (168810024), we get a palindrome (588828885).

The spelling of 420018861 in words is "four hundred twenty million, eighteen thousand, eight hundred sixty-one".