434223781 has 2 divisors, whose sum is σ = 434223782. Its totient is φ = 434223780.

The previous prime is 434223773. The next prime is 434223787. The reversal of 434223781 is 187322434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 6974881 = 20670^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 434223781 - 2³ = 434223773 is a prime.

It is a super-2 number, since 2×434223781² = 377100583971871922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (434223787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217111890 + 217111891.

It is an arithmetic number, because the mean of its divisors is an integer number (217111891).

Almost surely, 2^434223781 is an apocalyptic number.

It is an amenable number.

434223781 is a deficient number, since it is larger than the sum of its proper divisors (1).

434223781 is an equidigital number, since it uses as much as digits as its factorization.

434223781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 34.

The square root of 434223781 is about 20838.0368797063. The cubic root of 434223781 is about 757.2475348721.

The spelling of 434223781 in words is "four hundred thirty-four million, two hundred twenty-three thousand, seven hundred eighty-one".