400210505 has 4 divisors (see below), whose sum is σ = 480252612. Its totient is φ = 320168400.

The previous prime is 400210501. The next prime is 400210507. The reversal of 400210505 is 505012004.

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 80802121 + 319408384 = 8989^2 + 17872^2 .

It is not a de Polignac number, because 400210505 - 2² = 400210501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400210501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40021046 + ... + 40021055.

It is an arithmetic number, because the mean of its divisors is an integer number (120063153).

Almost surely, 2^400210505 is an apocalyptic number.

It is an amenable number.

400210505 is a deficient number, since it is larger than the sum of its proper divisors (80042107).

400210505 is an equidigital number, since it uses as much as digits as its factorization.

400210505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80042106.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 400210505 is about 20005.2619328016. The cubic root of 400210505 is about 736.9355282365.

Adding to 400210505 its reverse (505012004), we get a palindrome (905222509).

The spelling of 400210505 in words is "four hundred million, two hundred ten thousand, five hundred five".