400003243 has 16 divisors (see below), whose sum is σ = 419924736. Its totient is φ = 380671200.

The previous prime is 400003223. The next prime is 400003259. The reversal of 400003243 is 342300004.

It is a cyclic number.

It is not a de Polignac number, because 400003243 - 2⁵ = 400003211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400003223) 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 15 ways as a sum of consecutive naturals, for example, 380068 + ... + 381118.

It is an arithmetic number, because the mean of its divisors is an integer number (26245296).

Almost surely, 2^400003243 is an apocalyptic number.

400003243 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

400003243 is a deficient number, since it is larger than the sum of its proper divisors (19921493).

400003243 is a wasteful number, since it uses less digits than its factorization.

400003243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 400003243 is about 20000.0810748357. The cubic root of 400003243 is about 736.8082909417.

Adding to 400003243 its reverse (342300004), we get a palindrome (742303247).

The spelling of 400003243 in words is "four hundred million, three thousand, two hundred forty-three".