42247881 has 12 divisors (see below), whose sum is σ = 65719108. Its totient is φ = 25998624.

The previous prime is 42247861. The next prime is 42247883. The reversal of 42247881 is 18874224.

It can be written as a sum of positive squares in 2 ways, for example, as 13571856 + 28676025 = 3684^2 + 5355^2 .

It is not a de Polignac number, because 42247881 - 2⁶ = 42247817 is a prime.

It is a super-2 number, since 2×42247881² = 3569766897980322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42247883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180430 + ... + 180663.

Almost surely, 2^42247881 is an apocalyptic number.

It is an amenable number.

42247881 is a deficient number, since it is larger than the sum of its proper divisors (23471227).

42247881 is a wasteful number, since it uses less digits than its factorization.

42247881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361112 (or 361109 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 42247881 is about 6499.8369979562. The cubic root of 42247881 is about 348.2851655859.

The spelling of 42247881 in words is "forty-two million, two hundred forty-seven thousand, eight hundred eighty-one".