42011857 has 2 divisors, whose sum is σ = 42011858. Its totient is φ = 42011856.

The previous prime is 42011821. The next prime is 42011863. The reversal of 42011857 is 75811024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32764176 + 9247681 = 5724^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 42011857 - 2¹¹ = 42009809 is a prime.

It is a super-2 number, since 2×42011857² = 3529992257176898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42011867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21005928 + 21005929.

It is an arithmetic number, because the mean of its divisors is an integer number (21005929).

Almost surely, 2^42011857 is an apocalyptic number.

It is an amenable number.

42011857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42011857 is an equidigital number, since it uses as much as digits as its factorization.

42011857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 42011857 is about 6481.6554212639. The cubic root of 42011857 is about 347.6353719252.

The spelling of 42011857 in words is "forty-two million, eleven thousand, eight hundred fifty-seven".