400120143 has 32 divisors (see below), whose sum is σ = 574801920. Its totient is φ = 246689280.

The previous prime is 400120139. The next prime is 400120151. The reversal of 400120143 is 341021004.

It is not a de Polignac number, because 400120143 - 2² = 400120139 is a prime.

It is a super-2 number, since 2×400120143² = 320192257668680898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400120103) 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, 928138 + ... + 928568.

It is an arithmetic number, because the mean of its divisors is an integer number (17962560).

Almost surely, 2^400120143 is an apocalyptic number.

400120143 is a deficient number, since it is larger than the sum of its proper divisors (174681777).

400120143 is a wasteful number, since it uses less digits than its factorization.

400120143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 400120143 is about 20003.0033494973. The cubic root of 400120143 is about 736.8800607764.

Adding to 400120143 its reverse (341021004), we get a palindrome (741141147).

The spelling of 400120143 in words is "four hundred million, one hundred twenty thousand, one hundred forty-three".