420590789 has 4 divisors (see below), whose sum is σ = 422427660. Its totient is φ = 418753920.

The previous prime is 420590773. The next prime is 420590813. The reversal of 420590789 is 987095024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211557025 + 209033764 = 14545^2 + 14458^2 .

It is a cyclic number.

It is not a de Polignac number, because 420590789 - 2⁴ = 420590773 is a prime.

It is a super-2 number, since 2×420590789² = 353793223583285042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420590759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918092 + ... + 918549.

It is an arithmetic number, because the mean of its divisors is an integer number (105606915).

Almost surely, 2^420590789 is an apocalyptic number.

It is an amenable number.

420590789 is a deficient number, since it is larger than the sum of its proper divisors (1836871).

420590789 is a wasteful number, since it uses less digits than its factorization.

420590789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836870.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 420590789 is about 20508.3102424359. The cubic root of 420590789 is about 749.2382125759.

The spelling of 420590789 in words is "four hundred twenty million, five hundred ninety thousand, seven hundred eighty-nine".