408888842 has 4 divisors (see below), whose sum is σ = 613333266. Its totient is φ = 204444420.

The previous prime is 408888833. The next prime is 408888847. The reversal of 408888842 is 248888804.

It is a happy number.

It is a Cunningham number, because it is equal to 20221²+1.

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., 408888841 + 1 = 20221^2 + 1^2 .

It is a super-2 number, since 2×408888842² = 334380170224201928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (408888847) 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, 102222209 + ... + 102222212.

Almost surely, 2^408888842 is an apocalyptic number.

408888842 is a deficient number, since it is larger than the sum of its proper divisors (204444424).

408888842 is a wasteful number, since it uses less digits than its factorization.

408888842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204444423.

The product of its (nonzero) digits is 1048576, while the sum is 50.

The square root of 408888842 is about 20221.0000247268. Note that the first 4 decimals coincide. The cubic root of 408888842 is about 742.2241593094.

The spelling of 408888842 in words is "four hundred eight million, eight hundred eighty-eight thousand, eight hundred forty-two".