400013343 has 16 divisors (see below), whose sum is σ = 607068000. Its totient is φ = 260170560.

The previous prime is 400013321. The next prime is 400013357. The reversal of 400013343 is 343310004.

It is not a de Polignac number, because 400013343 - 2⁵ = 400013311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400013143) 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 15 ways as a sum of consecutive naturals, for example, 179568 + ... + 181781.

It is an arithmetic number, because the mean of its divisors is an integer number (37941750).

Almost surely, 2^400013343 is an apocalyptic number.

400013343 is a deficient number, since it is larger than the sum of its proper divisors (207054657).

400013343 is a wasteful number, since it uses less digits than its factorization.

400013343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361399 (or 361393 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 400013343 is about 20000.3335722182. Note that the first 3 decimals coincide. The cubic root of 400013343 is about 736.8144923090.

Adding to 400013343 its reverse (343310004), we get a palindrome (743323347).

The spelling of 400013343 in words is "four hundred million, thirteen thousand, three hundred forty-three".