400240231 has 8 divisors (see below), whose sum is σ = 424058544. Its totient is φ = 376452480.

The previous prime is 400240219. The next prime is 400240249. The reversal of 400240231 is 132042004.

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 400240231 - 2⁵ = 400240199 is a prime.

It is a super-2 number, since 2×400240231² = 320384485021866722, 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 (400240331) 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, 22836 + ... + 36358.

It is an arithmetic number, because the mean of its divisors is an integer number (53007318).

Almost surely, 2^400240231 is an apocalyptic number.

400240231 is a deficient number, since it is larger than the sum of its proper divisors (23818313).

400240231 is a wasteful number, since it uses less digits than its factorization.

400240231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15281.

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

The square root of 400240231 is about 20006.0048735373. The cubic root of 400240231 is about 736.9537733041.

Adding to 400240231 its reverse (132042004), we get a palindrome (532282235).

The spelling of 400240231 in words is "four hundred million, two hundred forty thousand, two hundred thirty-one".