400000431 has 8 divisors (see below), whose sum is σ = 535072384. Its totient is φ = 265797720.

The previous prime is 400000411. The next prime is 400000457. The reversal of 400000431 is 134000004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400000431 - 2¹¹ = 399998383 is a prime.

It is a super-2 number, since 2×400000431² = 320000689600371522, 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 (400000411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216235 + ... + 218076.

It is an arithmetic number, because the mean of its divisors is an integer number (66884048).

Almost surely, 2^400000431 is an apocalyptic number.

400000431 is a deficient number, since it is larger than the sum of its proper divisors (135071953).

400000431 is a wasteful number, since it uses less digits than its factorization.

400000431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434621.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400000431 is about 20000.0107749971. The cubic root of 400000431 is about 736.8065643642.

Adding to 400000431 its reverse (134000004), we get a palindrome (534000435).

The spelling of 400000431 in words is "four hundred million, four hundred thirty-one", and thus it is an aban number.