420355556 has 6 divisors (see below), whose sum is σ = 735622230. Its totient is φ = 210177776.

The previous prime is 420355553. The next prime is 420355619. The reversal of 420355556 is 655553024.

It can be written as a sum of positive squares in only one way, i.e., 350064100 + 70291456 = 18710^2 + 8384^2 .

It is not an unprimeable number, because it can be changed into a prime (420355553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52544441 + ... + 52544448.

It is an arithmetic number, because the mean of its divisors is an integer number (122603705).

Almost surely, 2^420355556 is an apocalyptic number.

It is an amenable number.

420355556 is a deficient number, since it is larger than the sum of its proper divisors (315266674).

420355556 is a wasteful number, since it uses less digits than its factorization.

420355556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105088893 (or 105088891 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The square root of 420355556 is about 20502.5743749413. The cubic root of 420355556 is about 749.0985055853.

The spelling of 420355556 in words is "four hundred twenty million, three hundred fifty-five thousand, five hundred fifty-six".