420731785 has 8 divisors (see below), whose sum is σ = 507668616. Its totient is φ = 334725120.

The previous prime is 420731771. The next prime is 420731809. The reversal of 420731785 is 587137024.

It can be written as a sum of positive squares in 4 ways, for example, as 24443136 + 396288649 = 4944^2 + 19907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420731785 - 2¹⁹ = 420207497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231544 + ... + 233353.

It is an arithmetic number, because the mean of its divisors is an integer number (63458577).

Almost surely, 2^420731785 is an apocalyptic number.

It is an amenable number.

420731785 is a deficient number, since it is larger than the sum of its proper divisors (86936831).

420731785 is a wasteful number, since it uses less digits than its factorization.

420731785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465083.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 420731785 is about 20511.7474877203. The cubic root of 420731785 is about 749.3219263989.

The spelling of 420731785 in words is "four hundred twenty million, seven hundred thirty-one thousand, seven hundred eighty-five".