400041243 has 24 divisors (see below), whose sum is σ = 673868000. Its totient is φ = 228593232.

The previous prime is 400041217. The next prime is 400041247. The reversal of 400041243 is 342140004.

It is not a de Polignac number, because 400041243 - 2²⁰ = 398992667 is a prime.

It is a super-2 number, since 2×400041243² = 320065992201970098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400041247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61708 + ... + 67881.

Almost surely, 2^400041243 is an apocalyptic number.

400041243 is a deficient number, since it is larger than the sum of its proper divisors (273826757).

400041243 is a wasteful number, since it uses less digits than its factorization.

400041243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129616 (or 129599 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400041243 is about 20001.0310484235. The cubic root of 400041243 is about 736.8316222763.

Adding to 400041243 its reverse (342140004), we get a palindrome (742181247).

The spelling of 400041243 in words is "four hundred million, forty-one thousand, two hundred forty-three".