42342749 has 2 divisors, whose sum is σ = 42342750. Its totient is φ = 42342748.

The previous prime is 42342721. The next prime is 42342757. The reversal of 42342749 is 94724324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32376100 + 9966649 = 5690^2 + 3157^2 .

It is a cyclic number.

It is not a de Polignac number, because 42342749 - 2⁸ = 42342493 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42342799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21171374 + 21171375.

It is an arithmetic number, because the mean of its divisors is an integer number (21171375).

Almost surely, 2^42342749 is an apocalyptic number.

It is an amenable number.

42342749 is a deficient number, since it is larger than the sum of its proper divisors (1).

42342749 is an equidigital number, since it uses as much as digits as its factorization.

42342749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 35.

The square root of 42342749 is about 6507.1306272427. The cubic root of 42342749 is about 348.5456631993.

The spelling of 42342749 in words is "forty-two million, three hundred forty-two thousand, seven hundred forty-nine".