400112291 has 4 divisors (see below), whose sum is σ = 409417272. Its totient is φ = 390807312.

The previous prime is 400112267. The next prime is 400112309. The reversal of 400112291 is 192211004.

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 400112291 - 2²⁶ = 333003427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400112201) 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, 4652426 + ... + 4652511.

It is an arithmetic number, because the mean of its divisors is an integer number (102354318).

Almost surely, 2^400112291 is an apocalyptic number.

400112291 is a deficient number, since it is larger than the sum of its proper divisors (9304981).

400112291 is an equidigital number, since it uses as much as digits as its factorization.

400112291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9304980.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 400112291 is about 20002.8070780078. The cubic root of 400112291 is about 736.8752405408.

Adding to 400112291 its reverse (192211004), we get a palindrome (592323295).

The spelling of 400112291 in words is "four hundred million, one hundred twelve thousand, two hundred ninety-one".