402861 has 4 divisors (see below), whose sum is σ = 537152. Its totient is φ = 268572.

The previous prime is 402859. The next prime is 402863. The reversal of 402861 is 168204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (402859) and next prime (402863).

It is not a de Polignac number, because 402861 - 2¹ = 402859 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402863) 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, 67141 + ... + 67146.

It is an arithmetic number, because the mean of its divisors is an integer number (134288).

2⁴⁰²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

402861 is a deficient number, since it is larger than the sum of its proper divisors (134291).

402861 is a wasteful number, since it uses less digits than its factorization.

402861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134290.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 402861 is about 634.7133211143. The cubic root of 402861 is about 73.8558797119.

The spelling of 402861 in words is "four hundred two thousand, eight hundred sixty-one".