442734781 has 2 divisors, whose sum is σ = 442734782. Its totient is φ = 442734780.

The previous prime is 442734763. The next prime is 442734821. The reversal of 442734781 is 187437244.

It is an a-pointer prime, because the next prime (442734821) can be obtained adding 442734781 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276556900 + 166177881 = 16630^2 + 12891^2 .

It is a cyclic number.

It is not a de Polignac number, because 442734781 - 2²³ = 434346173 is a prime.

It is a super-2 number, since 2×442734781² = 392028172614235922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442734701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221367390 + 221367391.

It is an arithmetic number, because the mean of its divisors is an integer number (221367391).

Almost surely, 2^442734781 is an apocalyptic number.

It is an amenable number.

442734781 is a deficient number, since it is larger than the sum of its proper divisors (1).

442734781 is an equidigital number, since it uses as much as digits as its factorization.

442734781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 40.

The square root of 442734781 is about 21041.2637690800. The cubic root of 442734781 is about 762.1630329051.

The spelling of 442734781 in words is "four hundred forty-two million, seven hundred thirty-four thousand, seven hundred eighty-one".