400040431 has 8 divisors (see below), whose sum is σ = 457416320. Its totient is φ = 342721368.

The previous prime is 400040429. The next prime is 400040441. The reversal of 400040431 is 134040004.

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

It is a cyclic number.

It is not a de Polignac number, because 400040431 - 2¹ = 400040429 is a prime.

It is a super-2 number, since 2×400040431² = 320064692869331522, 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 (400040441) 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 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 28366.

It is an arithmetic number, because the mean of its divisors is an integer number (57177040).

Almost surely, 2^400040431 is an apocalyptic number.

400040431 is a deficient number, since it is larger than the sum of its proper divisors (57375889).

400040431 is a wasteful number, since it uses less digits than its factorization.

400040431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28413.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 400040431 is about 20001.0107494596. The cubic root of 400040431 is about 736.8311237380.

Adding to 400040431 its reverse (134040004), we get a palindrome (534080435).

The spelling of 400040431 in words is "four hundred million, forty thousand, four hundred thirty-one".