400402143 has 32 divisors (see below), whose sum is σ = 635040000. Its totient is φ = 248580576.

The previous prime is 400402127. The next prime is 400402183. The reversal of 400402143 is 341204004.

It is not a de Polignac number, because 400402143 - 2⁴ = 400402127 is a prime.

It is a super-2 number, since 2×400402143² = 320643752237984898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400402103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23653 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (19845000).

Almost surely, 2^400402143 is an apocalyptic number.

400402143 is a deficient number, since it is larger than the sum of its proper divisors (234637857).

400402143 is a wasteful number, since it uses less digits than its factorization.

400402143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13316 (or 13310 counting only the distinct ones).

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

The square root of 400402143 is about 20010.0510494101. The cubic root of 400402143 is about 737.0531349405.

Adding to 400402143 its reverse (341204004), we get a palindrome (741606147).

The spelling of 400402143 in words is "four hundred million, four hundred two thousand, one hundred forty-three".