406663641 has 18 divisors (see below), whose sum is σ = 591205758. Its totient is φ = 269360640.

The previous prime is 406663619. The next prime is 406663643. The reversal of 406663641 is 146366604.

It can be written as a sum of positive squares in 3 ways, for example, as 2653641 + 404010000 = 1629^2 + 20100^2 .

It is not a de Polignac number, because 406663641 - 2¹⁰ = 406662617 is a prime.

It is a super-2 number, since 2×406663641² = 330750633822753762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 406663596 and 406663605.

It is not an unprimeable number, because it can be changed into a prime (406663643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 938961 + ... + 939393.

Almost surely, 2^406663641 is an apocalyptic number.

It is an amenable number.

406663641 is a deficient number, since it is larger than the sum of its proper divisors (184542117).

406663641 is an equidigital number, since it uses as much as digits as its factorization.

406663641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 406663641 is about 20165.9029304418. The cubic root of 406663641 is about 740.8752979572.

The spelling of 406663641 in words is "four hundred six million, six hundred sixty-three thousand, six hundred forty-one".