405726641 has 4 divisors (see below), whose sum is σ = 429592932. Its totient is φ = 381860352.

The previous prime is 405726637. The next prime is 405726649. The reversal of 405726641 is 146627504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 261630625 + 144096016 = 16175^2 + 12004^2 .

It is a cyclic number.

It is not a de Polignac number, because 405726641 - 2² = 405726637 is a prime.

It is a super-2 number, since 2×405726641² = 329228214434285762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405726649) 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, 11933120 + ... + 11933153.

It is an arithmetic number, because the mean of its divisors is an integer number (107398233).

Almost surely, 2^405726641 is an apocalyptic number.

It is an amenable number.

405726641 is a deficient number, since it is larger than the sum of its proper divisors (23866291).

405726641 is a wasteful number, since it uses less digits than its factorization.

405726641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23866290.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 405726641 is about 20142.6572477417. The cubic root of 405726641 is about 740.3058396137.

The spelling of 405726641 in words is "four hundred five million, seven hundred twenty-six thousand, six hundred forty-one".