420173109 has 16 divisors (see below), whose sum is σ = 627027840. Its totient is φ = 278068320.

The previous prime is 420173107. The next prime is 420173111. The reversal of 420173109 is 901371024.

It is an interprime number because it is at equal distance from previous prime (420173107) and next prime (420173111).

It is not a de Polignac number, because 420173109 - 2¹ = 420173107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420173107) 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, 53097 + ... + 60494.

It is an arithmetic number, because the mean of its divisors is an integer number (39189240).

Almost surely, 2^420173109 is an apocalyptic number.

It is an amenable number.

420173109 is a deficient number, since it is larger than the sum of its proper divisors (206854731).

420173109 is a wasteful number, since it uses less digits than its factorization.

420173109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113737 (or 113731 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 420173109 is about 20498.1245239656. The cubic root of 420173109 is about 748.9901127808.

The spelling of 420173109 in words is "four hundred twenty million, one hundred seventy-three thousand, one hundred nine".