42090457 has 2 divisors, whose sum is σ = 42090458. Its totient is φ = 42090456.

The previous prime is 42090449. The next prime is 42090463. The reversal of 42090457 is 75409024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 20967241 = 4596^2 + 4579^2 .

It is a cyclic number.

It is not a de Polignac number, because 42090457 - 2³ = 42090449 is a prime.

It is not a weakly prime, because it can be changed into another prime (42090407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045228 + 21045229.

It is an arithmetic number, because the mean of its divisors is an integer number (21045229).

Almost surely, 2^42090457 is an apocalyptic number.

It is an amenable number.

42090457 is a deficient number, since it is larger than the sum of its proper divisors (1).

42090457 is an equidigital number, since it uses as much as digits as its factorization.

42090457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 42090457 is about 6487.7158538271. The cubic root of 42090457 is about 347.8520339156.

The spelling of 42090457 in words is "forty-two million, ninety thousand, four hundred fifty-seven".