42408681 has 8 divisors (see below), whose sum is σ = 64622784. Its totient is φ = 24233520.

The previous prime is 42408677. The next prime is 42408689. The reversal of 42408681 is 18680424.

42408681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42408681 - 2² = 42408677 is a prime.

It is a super-2 number, since 2×42408681² = 3596992448319522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42408689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009710 + ... + 1009751.

It is an arithmetic number, because the mean of its divisors is an integer number (8077848).

Almost surely, 2^42408681 is an apocalyptic number.

It is an amenable number.

42408681 is a deficient number, since it is larger than the sum of its proper divisors (22214103).

42408681 is a wasteful number, since it uses less digits than its factorization.

42408681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019471.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 42408681 is about 6512.1947913127. The cubic root of 42408681 is about 348.7264764905.

It can be divided in two parts, 4240 and 8681, that added together give a palindrome (12921).

The spelling of 42408681 in words is "forty-two million, four hundred eight thousand, six hundred eighty-one".