427043821 has 6 divisors (see below), whose sum is σ = 442278122. Its totient is φ = 412317360.

The previous prime is 427043809. The next prime is 427043831. The reversal of 427043821 is 128340724.

It can be written as a sum of positive squares in 3 ways, for example, as 29041321 + 398002500 = 5389^2 + 19950^2 .

It is not a de Polignac number, because 427043821 - 2²⁵ = 393489389 is a prime.

It is a super-3 number, since 3×427043821³ (a number of 27 digits) contains 333 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 (427043801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253050 + ... + 254731.

Almost surely, 2^427043821 is an apocalyptic number.

It is an amenable number.

427043821 is a deficient number, since it is larger than the sum of its proper divisors (15234301).

427043821 is an equidigital number, since it uses as much as digits as its factorization.

427043821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507839 (or 507810 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 427043821 is about 20665.0386159813. The cubic root of 427043821 is about 753.0505801616.

The spelling of 427043821 in words is "four hundred twenty-seven million, forty-three thousand, eight hundred twenty-one".