342429781 has 2 divisors, whose sum is σ = 342429782. Its totient is φ = 342429780.

The previous prime is 342429757. The next prime is 342429821. The reversal of 342429781 is 187924243.

It is an a-pointer prime, because the next prime (342429821) can be obtained adding 342429781 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., 232074756 + 110355025 = 15234^2 + 10505^2 .

It is a cyclic number.

It is not a de Polignac number, because 342429781 - 2⁷ = 342429653 is a prime.

It is a super-2 number, since 2×342429781² = 234516309831415922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342429721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171214890 + 171214891.

It is an arithmetic number, because the mean of its divisors is an integer number (171214891).

Almost surely, 2^342429781 is an apocalyptic number.

342429781 is the 11704-th centered pentagonal number.

It is an amenable number.

342429781 is a deficient number, since it is larger than the sum of its proper divisors (1).

342429781 is an equidigital number, since it uses as much as digits as its factorization.

342429781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 342429781 is about 18504.8583080228. The cubic root of 342429781 is about 699.6118807631.

The spelling of 342429781 in words is "three hundred forty-two million, four hundred twenty-nine thousand, seven hundred eighty-one".