421798477 has 4 divisors (see below), whose sum is σ = 424877436. Its totient is φ = 418719520.

The previous prime is 421798451. The next prime is 421798547. The reversal of 421798477 is 774897124.

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 225630441 + 196168036 = 15021^2 + 14006^2 .

It is a cyclic number.

It is not a de Polignac number, because 421798477 - 2¹¹ = 421796429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421798477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421798427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539274 + ... + 1539547.

It is an arithmetic number, because the mean of its divisors is an integer number (106219359).

Almost surely, 2^421798477 is an apocalyptic number.

It is an amenable number.

421798477 is a deficient number, since it is larger than the sum of its proper divisors (3078959).

421798477 is a wasteful number, since it uses less digits than its factorization.

421798477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078958.

The product of its digits is 790272, while the sum is 49.

The square root of 421798477 is about 20537.7330053733. The cubic root of 421798477 is about 749.9546502950.

The spelling of 421798477 in words is "four hundred twenty-one million, seven hundred ninety-eight thousand, four hundred seventy-seven".