42856691 has 2 divisors, whose sum is σ = 42856692. Its totient is φ = 42856690.

The previous prime is 42856679. The next prime is 42856727. The reversal of 42856691 is 19665824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42856691 - 2¹⁸ = 42594547 is a prime.

It is not a weakly prime, because it can be changed into another prime (42856651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428345 + 21428346.

It is an arithmetic number, because the mean of its divisors is an integer number (21428346).

Almost surely, 2^42856691 is an apocalyptic number.

42856691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856691 is an equidigital number, since it uses as much as digits as its factorization.

42856691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 42856691 is about 6546.5021958295. The cubic root of 42856691 is about 349.9501724985.

The spelling of 42856691 in words is "forty-two million, eight hundred fifty-six thousand, six hundred ninety-one".