400112691 has 16 divisors (see below), whose sum is σ = 600757248. Its totient is φ = 234669600.

The previous prime is 400112653. The next prime is 400112707. The reversal of 400112691 is 196211004.

It is not a de Polignac number, because 400112691 - 2¹⁰ = 400111667 is a prime.

It is a super-2 number, since 2×400112691² = 320180330998522962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400112641) 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 15 ways as a sum of consecutive naturals, for example, 194536 + ... + 196581.

It is an arithmetic number, because the mean of its divisors is an integer number (37547328).

Almost surely, 2^400112691 is an apocalyptic number.

400112691 is a deficient number, since it is larger than the sum of its proper divisors (200644557).

400112691 is a wasteful number, since it uses less digits than its factorization.

400112691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391162.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 400112691 is about 20002.8170766020. The cubic root of 400112691 is about 736.8754860969.

Adding to 400112691 its reverse (196211004), we get a palindrome (596323695).

The spelling of 400112691 in words is "four hundred million, one hundred twelve thousand, six hundred ninety-one".