400430431 has 4 divisors (see below), whose sum is σ = 400470664. Its totient is φ = 400390200.

The previous prime is 400430419. The next prime is 400430473. The reversal of 400430431 is 134034004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400430431 - 2¹¹ = 400428383 is a prime.

It is a super-2 number, since 2×400430431² = 320689060141691522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400430399 and 400430408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400430411) 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 3 ways as a sum of consecutive naturals, for example, 6976 + ... + 29146.

It is an arithmetic number, because the mean of its divisors is an integer number (100117666).

Almost surely, 2^400430431 is an apocalyptic number.

400430431 is a deficient number, since it is larger than the sum of its proper divisors (40233).

400430431 is a wasteful number, since it uses less digits than its factorization.

400430431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40232.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 400430431 is about 20010.7578816995. The cubic root of 400430431 is about 737.0704918806.

Adding to 400430431 its reverse (134034004), we get a palindrome (534464435).

The spelling of 400430431 in words is "four hundred million, four hundred thirty thousand, four hundred thirty-one".