427503821 has 2 divisors, whose sum is σ = 427503822. Its totient is φ = 427503820.

The previous prime is 427503803. The next prime is 427503833. The reversal of 427503821 is 128305724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 2937796 = 20605^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 427503821 - 2¹⁰ = 427502797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427503421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213751910 + 213751911.

It is an arithmetic number, because the mean of its divisors is an integer number (213751911).

Almost surely, 2^427503821 is an apocalyptic number.

It is an amenable number.

427503821 is a deficient number, since it is larger than the sum of its proper divisors (1).

427503821 is an equidigital number, since it uses as much as digits as its factorization.

427503821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 427503821 is about 20676.1655294206. The cubic root of 427503821 is about 753.3208716754.

The spelling of 427503821 in words is "four hundred twenty-seven million, five hundred three thousand, eight hundred twenty-one".