42423709 has 2 divisors, whose sum is σ = 42423710. Its totient is φ = 42423708.

The previous prime is 42423701. The next prime is 42423809. The reversal of 42423709 is 90732424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 14100025 = 5322^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 42423709 - 2³ = 42423701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42423701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21211854 + 21211855.

It is an arithmetic number, because the mean of its divisors is an integer number (21211855).

Almost surely, 2^42423709 is an apocalyptic number.

It is an amenable number.

42423709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42423709 is an equidigital number, since it uses as much as digits as its factorization.

42423709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42423709 is about 6513.3485243767. The cubic root of 42423709 is about 348.7676633611.

The spelling of 42423709 in words is "forty-two million, four hundred twenty-three thousand, seven hundred nine".