403288381 has 4 divisors (see below), whose sum is σ = 403668832. Its totient is φ = 402907932.

The previous prime is 403288349. The next prime is 403288387. The reversal of 403288381 is 183882304.

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 403288381 - 2⁵ = 403288349 is a prime.

It is a super-2 number, since 2×403288381² = 325283036499202322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 403288381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403288387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188631 + ... + 190756.

It is an arithmetic number, because the mean of its divisors is an integer number (100917208).

Almost surely, 2^403288381 is an apocalyptic number.

It is an amenable number.

403288381 is a deficient number, since it is larger than the sum of its proper divisors (380451).

403288381 is a wasteful number, since it uses less digits than its factorization.

403288381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380450.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 403288381 is about 20082.0412558086. The cubic root of 403288381 is about 738.8198751286.

The spelling of 403288381 in words is "four hundred three million, two hundred eighty-eight thousand, three hundred eighty-one".