420169806 has 72 divisors (see below), whose sum is σ = 1095583320. Its totient is φ = 115901856.

The previous prime is 420169751. The next prime is 420169811. The reversal of 420169806 is 608961024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17365 + ... + 33791.

It is an arithmetic number, because the mean of its divisors is an integer number (15216435).

Almost surely, 2^420169806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420169806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547791660).

420169806 is an abundant number, since it is smaller than the sum of its proper divisors (675413514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420169806 is a wasteful number, since it uses less digits than its factorization.

420169806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16478 (or 16468 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 420169806 is about 20498.0439554607. The cubic root of 420169806 is about 748.9881501604.

The spelling of 420169806 in words is "four hundred twenty million, one hundred sixty-nine thousand, eight hundred six".