42693881 has 2 divisors, whose sum is σ = 42693882. Its totient is φ = 42693880.

The previous prime is 42693869. The next prime is 42693901. The reversal of 42693881 is 18839624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35295481 + 7398400 = 5941^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 42693881 - 2¹⁸ = 42431737 is a prime.

It is a super-2 number, since 2×42693881² = 3645534949684322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42693841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21346940 + 21346941.

It is an arithmetic number, because the mean of its divisors is an integer number (21346941).

Almost surely, 2^42693881 is an apocalyptic number.

It is an amenable number.

42693881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42693881 is an equidigital number, since it uses as much as digits as its factorization.

42693881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 42693881 is about 6534.0554787972. The cubic root of 42693881 is about 349.5064635731.

The spelling of 42693881 in words is "forty-two million, six hundred ninety-three thousand, eight hundred eighty-one".