402066121 has 12 divisors (see below), whose sum is σ = 417818700. Its totient is φ = 386888768.

The previous prime is 402066083. The next prime is 402066143. The reversal of 402066121 is 121660204.

It can be written as a sum of positive squares in 6 ways, for example, as 19316025 + 382750096 = 4395^2 + 19564^2 .

It is not a de Polignac number, because 402066121 - 2²¹ = 399968969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402066092 and 402066101.

It is not an unprimeable number, because it can be changed into a prime (402066191) 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 11 ways as a sum of consecutive naturals, for example, 326535 + ... + 327763.

It is an arithmetic number, because the mean of its divisors is an integer number (34818225).

Almost surely, 2^402066121 is an apocalyptic number.

It is an amenable number.

402066121 is a deficient number, since it is larger than the sum of its proper divisors (15752579).

402066121 is a wasteful number, since it uses less digits than its factorization.

402066121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 402066121 is about 20051.5864958362. The cubic root of 402066121 is about 738.0727308652.

The spelling of 402066121 in words is "four hundred two million, sixty-six thousand, one hundred twenty-one".