400810681 has 4 divisors (see below), whose sum is σ = 421906000. Its totient is φ = 379715364.

The previous prime is 400810651. The next prime is 400810703. The reversal of 400810681 is 186018004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400810681 - 2⁹ = 400810169 is a prime.

It is a super-2 number, since 2×400810681² = 321298404007367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400810601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10547631 + ... + 10547668.

It is an arithmetic number, because the mean of its divisors is an integer number (105476500).

Almost surely, 2^400810681 is an apocalyptic number.

It is an amenable number.

400810681 is a deficient number, since it is larger than the sum of its proper divisors (21095319).

400810681 is a wasteful number, since it uses less digits than its factorization.

400810681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21095318.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 400810681 is about 20020.2567665852. The cubic root of 400810681 is about 737.3037262240.

Adding to 400810681 its reverse (186018004), we get a palindrome (586828685).

The spelling of 400810681 in words is "four hundred million, eight hundred ten thousand, six hundred eighty-one".