400143305 has 16 divisors (see below), whose sum is σ = 518330880. Its totient is φ = 295635648.

The previous prime is 400143301. The next prime is 400143307. The reversal of 400143305 is 503341004.

It is a cyclic number.

It is not a de Polignac number, because 400143305 - 2² = 400143301 is a prime.

It is a super-2 number, since 2×400143305² = 320229329072646050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400143301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56657 + ... + 63326.

It is an arithmetic number, because the mean of its divisors is an integer number (32395680).

Almost surely, 2^400143305 is an apocalyptic number.

It is an amenable number.

400143305 is a deficient number, since it is larger than the sum of its proper divisors (118187575).

400143305 is a wasteful number, since it uses less digits than its factorization.

400143305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120040.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 400143305 is about 20003.5823041774. The cubic root of 400143305 is about 736.8942792446.

Adding to 400143305 its reverse (503341004), we get a palindrome (903484309).

The spelling of 400143305 in words is "four hundred million, one hundred forty-three thousand, three hundred five".