400806243 has 6 divisors (see below), whose sum is σ = 578942364. Its totient is φ = 267204156.

The previous prime is 400806209. The next prime is 400806247. The reversal of 400806243 is 342608004.

It is not a de Polignac number, because 400806243 - 2⁸ = 400805987 is a prime.

It is a super-3 number, since 3×400806243³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (400806247) 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 5 ways as a sum of consecutive naturals, for example, 22267005 + ... + 22267022.

It is an arithmetic number, because the mean of its divisors is an integer number (96490394).

Almost surely, 2^400806243 is an apocalyptic number.

400806243 is a deficient number, since it is larger than the sum of its proper divisors (178136121).

400806243 is a wasteful number, since it uses less digits than its factorization.

400806243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44534033 (or 44534030 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 400806243 is about 20020.1459285391. The cubic root of 400806243 is about 737.3010049342.

The spelling of 400806243 in words is "four hundred million, eight hundred six thousand, two hundred forty-three".