403006381 has 2 divisors, whose sum is σ = 403006382. Its totient is φ = 403006380.

The previous prime is 403006379. The next prime is 403006393. The reversal of 403006381 is 183600304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386122500 + 16883881 = 19650^2 + 4109^2 .

It is a cyclic number.

It is not a de Polignac number, because 403006381 - 2¹ = 403006379 is a prime.

It is a super-2 number, since 2×403006381² = 324828286253434322, which contains 22 as substring.

Together with 403006379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403006081) 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 as a sum of consecutive naturals, namely, 201503190 + 201503191.

It is an arithmetic number, because the mean of its divisors is an integer number (201503191).

Almost surely, 2^403006381 is an apocalyptic number.

It is an amenable number.

403006381 is a deficient number, since it is larger than the sum of its proper divisors (1).

403006381 is an equidigital number, since it uses as much as digits as its factorization.

403006381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 403006381 is about 20075.0188293810. The cubic root of 403006381 is about 738.6476280090.

Adding to 403006381 its reverse (183600304), we get a palindrome (586606685).

The spelling of 403006381 in words is "four hundred three million, six thousand, three hundred eighty-one".