402161 has 4 divisors (see below), whose sum is σ = 403572. Its totient is φ = 400752.

The previous prime is 402139. The next prime is 402197. The reversal of 402161 is 161204.

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 93025 + 309136 = 305^2 + 556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402161 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402161.

It is not an unprimeable number, because it can be changed into a prime (402131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (100893).

2⁴⁰²¹⁶¹ is an apocalyptic number.

It is an amenable number.

402161 is a deficient number, since it is larger than the sum of its proper divisors (1411).

402161 is a wasteful number, since it uses less digits than its factorization.

402161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 402161 is about 634.1616513161. The cubic root of 402161 is about 73.8130782755.

Adding to 402161 its reverse (161204), we get a palindrome (563365).

The spelling of 402161 in words is "four hundred two thousand, one hundred sixty-one".