400134431 has 4 divisors (see below), whose sum is σ = 413932200. Its totient is φ = 386336664.

The previous prime is 400134421. The next prime is 400134437. The reversal of 400134431 is 134431004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400134431 is a prime.

It is a super-2 number, since 2×400134431² = 320215125743387522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400134437) 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, 6898841 + ... + 6898898.

It is an arithmetic number, because the mean of its divisors is an integer number (103483050).

Almost surely, 2^400134431 is an apocalyptic number.

400134431 is a deficient number, since it is larger than the sum of its proper divisors (13797769).

400134431 is a wasteful number, since it uses less digits than its factorization.

400134431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13797768.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 400134431 is about 20003.3604926772. The cubic root of 400134431 is about 736.8888318228. Note that the first 4 decimals are identical.

Adding to 400134431 its reverse (134431004), we get a palindrome (534565435).

It can be divided in two parts, 40013 and 4431, that added together give a palindrome (44444).

The spelling of 400134431 in words is "four hundred million, one hundred thirty-four thousand, four hundred thirty-one".