42390737 has 2 divisors, whose sum is σ = 42390738. Its totient is φ = 42390736.

The previous prime is 42390727. The next prime is 42390773. The reversal of 42390737 is 73709324.

Together with next prime (42390773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 192721 = 6496^2 + 439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42390737 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42390697 and 42390706.

It is not a weakly prime, because it can be changed into another prime (42390727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21195368 + 21195369.

It is an arithmetic number, because the mean of its divisors is an integer number (21195369).

Almost surely, 2^42390737 is an apocalyptic number.

It is an amenable number.

42390737 is a deficient number, since it is larger than the sum of its proper divisors (1).

42390737 is an equidigital number, since it uses as much as digits as its factorization.

42390737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 42390737 is about 6510.8169226296. The cubic root of 42390737 is about 348.6772850630.

The spelling of 42390737 in words is "forty-two million, three hundred ninety thousand, seven hundred thirty-seven".