427781819 has 2 divisors, whose sum is σ = 427781820. Its totient is φ = 427781818.

The previous prime is 427781777. The next prime is 427781833. The reversal of 427781819 is 918187724.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427781819 is a prime.

It is a super-2 number, since 2×427781819² = 365994569333897522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (427781839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213890909 + 213890910.

It is an arithmetic number, because the mean of its divisors is an integer number (213890910).

Almost surely, 2^427781819 is an apocalyptic number.

427781819 is a deficient number, since it is larger than the sum of its proper divisors (1).

427781819 is an equidigital number, since it uses as much as digits as its factorization.

427781819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 47.

The square root of 427781819 is about 20682.8871050441. The cubic root of 427781819 is about 753.4841266043.

The spelling of 427781819 in words is "four hundred twenty-seven million, seven hundred eighty-one thousand, eight hundred nineteen".