402143125 has 10 divisors (see below), whose sum is σ = 502518830. Its totient is φ = 321714000.

The previous prime is 402143123. The next prime is 402143173. The reversal of 402143125 is 521341204.

It can be written as a sum of positive squares in 5 ways, for example, as 35688676 + 366454449 = 5974^2 + 19143^2 .

It is not a de Polignac number, because 402143125 - 2¹ = 402143123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402143096 and 402143105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402143123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 321090 + ... + 322339.

It is an arithmetic number, because the mean of its divisors is an integer number (50251883).

Almost surely, 2^402143125 is an apocalyptic number.

It is an amenable number.

402143125 is a deficient number, since it is larger than the sum of its proper divisors (100375705).

402143125 is an frugal number, since it uses more digits than its factorization.

402143125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643449 (or 643434 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 402143125 is about 20053.5065512244. The cubic root of 402143125 is about 738.1198466020.

Adding to 402143125 its reverse (521341204), we get a palindrome (923484329).

The spelling of 402143125 in words is "four hundred two million, one hundred forty-three thousand, one hundred twenty-five".