400002431 has 2 divisors, whose sum is σ = 400002432. Its totient is φ = 400002430.

The previous prime is 400002413. The next prime is 400002433. The reversal of 400002431 is 134200004.

Together with previous prime (400002413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400002431 - 2²⁶ = 332893567 is a prime.

It is a super-2 number, since 2×400002431² = 320003889611819522, which contains 22 as substring.

Together with 400002433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400002433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200001215 + 200001216.

It is an arithmetic number, because the mean of its divisors is an integer number (200001216).

Almost surely, 2^400002431 is an apocalyptic number.

400002431 is a deficient number, since it is larger than the sum of its proper divisors (1).

400002431 is an equidigital number, since it uses as much as digits as its factorization.

400002431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400002431 is about 20000.0607749077. The cubic root of 400002431 is about 736.8077923718.

Adding to 400002431 its reverse (134200004), we get a palindrome (534202435).

The spelling of 400002431 in words is "four hundred million, two thousand, four hundred thirty-one".