402381 has 16 divisors (see below), whose sum is σ = 681600. Its totient is φ = 229824.

The previous prime is 402379. The next prime is 402383. The reversal of 402381 is 183204.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (402379) and next prime (402383).

It is not a de Polignac number, because 402381 - 2¹ = 402379 is a prime.

It is a super-2 number, since 2×402381² = 323820938322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (42600).

2⁴⁰²³⁸¹ is an apocalyptic number.

It is an amenable number.

402381 is a deficient number, since it is larger than the sum of its proper divisors (279219).

402381 is a wasteful number, since it uses less digits than its factorization.

402381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145 (or 2139 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 402381 is about 634.3350849512. The cubic root of 402381 is about 73.8265355037.

Adding to 402381 its reverse (183204), we get a palindrome (585585).

The spelling of 402381 in words is "four hundred two thousand, three hundred eighty-one".