400421611 has 4 divisors (see below), whose sum is σ = 406061424. Its totient is φ = 394781800.

The previous prime is 400421603. The next prime is 400421639. The reversal of 400421611 is 116124004.

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

It is a cyclic number.

It is not a de Polignac number, because 400421611 - 2³ = 400421603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400421641) 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, 2819800 + ... + 2819941.

It is an arithmetic number, because the mean of its divisors is an integer number (101515356).

Almost surely, 2^400421611 is an apocalyptic number.

400421611 is a deficient number, since it is larger than the sum of its proper divisors (5639813).

400421611 is an equidigital number, since it uses as much as digits as its factorization.

400421611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639812.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 400421611 is about 20010.5374990279. The cubic root of 400421611 is about 737.0650801961.

Adding to 400421611 its reverse (116124004), we get a palindrome (516545615).

The spelling of 400421611 in words is "four hundred million, four hundred twenty-one thousand, six hundred eleven".