408452681 has 12 divisors (see below), whose sum is σ = 511688772. Its totient is φ = 323170848.

The previous prime is 408452669. The next prime is 408452687. The reversal of 408452681 is 186254804.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72097081 + 336355600 = 8491^2 + 18340^2 .

It is not a de Polignac number, because 408452681 - 2¹⁰ = 408451657 is a prime.

It is a super-2 number, since 2×408452681² = 333667185232175522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (408452687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319970 + ... + 321243.

It is an arithmetic number, because the mean of its divisors is an integer number (42640731).

Almost surely, 2^408452681 is an apocalyptic number.

It is an amenable number.

408452681 is a deficient number, since it is larger than the sum of its proper divisors (103236091).

408452681 is a wasteful number, since it uses less digits than its factorization.

408452681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641240 (or 641233 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 408452681 is about 20210.2122947781. The cubic root of 408452681 is about 741.9601556865.

It can be divided in two parts, 4084 and 52681, that added together give a palindrome (56765).

The spelling of 408452681 in words is "four hundred eight million, four hundred fifty-two thousand, six hundred eighty-one".