403381 has 4 divisors (see below), whose sum is σ = 440064. Its totient is φ = 366700.

The previous prime is 403369. The next prime is 403387. The reversal of 403381 is 183304.

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 a cyclic number.

It is not a de Polignac number, because 403381 - 2⁷ = 403253 is a prime.

It is a super-2 number, since 2×403381² = 325432462322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18325 + ... + 18346.

It is an arithmetic number, because the mean of its divisors is an integer number (110016).

2⁴⁰³³⁸¹ is an apocalyptic number.

It is an amenable number.

403381 is a deficient number, since it is larger than the sum of its proper divisors (36683).

403381 is a wasteful number, since it uses less digits than its factorization.

403381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36682.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 403381 is about 635.1228227674. The cubic root of 403381 is about 73.8876429796.

Adding to 403381 its reverse (183304), we get a palindrome (586685).

It can be divided in two parts, 4033 and 81, that added together give a palindrome (4114).

The spelling of 403381 in words is "four hundred three thousand, three hundred eighty-one".