408718642 has 4 divisors (see below), whose sum is σ = 613077966. Its totient is φ = 204359320.

The previous prime is 408718631. The next prime is 408718649. The reversal of 408718642 is 246817804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 226171521 + 182547121 = 15039^2 + 13511^2 .

It is a junction number, because it is equal to n+sod(n) for n = 408718595 and 408718604.

It is not an unprimeable number, because it can be changed into a prime (408718649) 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 as a sum of consecutive naturals, namely, 102179659 + ... + 102179662.

Almost surely, 2^408718642 is an apocalyptic number.

408718642 is a deficient number, since it is larger than the sum of its proper divisors (204359324).

408718642 is a wasteful number, since it uses less digits than its factorization.

408718642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204359323.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 408718642 is about 20216.7910905762. The cubic root of 408718642 is about 742.1211614032.

The spelling of 408718642 in words is "four hundred eight million, seven hundred eighteen thousand, six hundred forty-two".