400143001 has 4 divisors (see below), whose sum is σ = 400435812. Its totient is φ = 399850192.

The previous prime is 400142999. The next prime is 400143011. The reversal of 400143001 is 100341004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 325838601 + 74304400 = 18051^2 + 8620^2 .

It is a cyclic number.

It is not a de Polignac number, because 400143001 - 2¹ = 400142999 is a prime.

It is a super-2 number, since 2×400143001² = 320228842498572002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400143011) 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 3 ways as a sum of consecutive naturals, for example, 144346 + ... + 147091.

It is an arithmetic number, because the mean of its divisors is an integer number (100108953).

Almost surely, 2^400143001 is an apocalyptic number.

It is an amenable number.

400143001 is a deficient number, since it is larger than the sum of its proper divisors (292811).

400143001 is a wasteful number, since it uses less digits than its factorization.

400143001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292810.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400143001 is about 20003.5747055370. The cubic root of 400143001 is about 736.8940926316.

Adding to 400143001 its reverse (100341004), we get a palindrome (500484005).

The spelling of 400143001 in words is "four hundred million, one hundred forty-three thousand, one".