427748891 has 2 divisors, whose sum is σ = 427748892. Its totient is φ = 427748890.

The previous prime is 427748887. The next prime is 427748899. The reversal of 427748891 is 198847724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 427748891 - 2² = 427748887 is a prime.

It is a super-2 number, since 2×427748891² = 365938227503459762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (427748899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213874445 + 213874446.

It is an arithmetic number, because the mean of its divisors is an integer number (213874446).

Almost surely, 2^427748891 is an apocalyptic number.

427748891 is a deficient number, since it is larger than the sum of its proper divisors (1).

427748891 is an equidigital number, since it uses as much as digits as its factorization.

427748891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The square root of 427748891 is about 20682.0910693286. The cubic root of 427748891 is about 753.4647932582.

The spelling of 427748891 in words is "four hundred twenty-seven million, seven hundred forty-eight thousand, eight hundred ninety-one".