400211005 has 4 divisors (see below), whose sum is σ = 480253212. Its totient is φ = 320168800.

The previous prime is 400210973. The next prime is 400211011. The reversal of 400211005 is 500112004.

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 75238276 + 324972729 = 8674^2 + 18027^2 .

It is not a de Polignac number, because 400211005 - 2⁵ = 400210973 is a prime.

It is a super-2 number, since 2×400211005² = 320337697046220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40021096 + ... + 40021105.

It is an arithmetic number, because the mean of its divisors is an integer number (120063303).

Almost surely, 2^400211005 is an apocalyptic number.

It is an amenable number.

400211005 is a deficient number, since it is larger than the sum of its proper divisors (80042207).

400211005 is an equidigital number, since it uses as much as digits as its factorization.

400211005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80042206.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 400211005 is about 20005.2744295098. The cubic root of 400211005 is about 736.9358351313.

Adding to 400211005 its reverse (500112004), we get a palindrome (900323009).

Subtracting 400211005 from its reverse (500112004), we obtain a palindrome (99900999).

The spelling of 400211005 in words is "four hundred million, two hundred eleven thousand, five".