40381321 has 4 divisors (see below), whose sum is σ = 40950144. Its totient is φ = 39812500.

The previous prime is 40381309. The next prime is 40381333. The reversal of 40381321 is 12318304.

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 (40381309) and next prime (40381333).

It is a cyclic number.

It is not a de Polignac number, because 40381321 - 2¹⁹ = 39857033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40381292 and 40381301.

It is not an unprimeable number, because it can be changed into a prime (40381381) 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, 284305 + ... + 284446.

It is an arithmetic number, because the mean of its divisors is an integer number (10237536).

Almost surely, 2^40381321 is an apocalyptic number.

It is an amenable number.

40381321 is a deficient number, since it is larger than the sum of its proper divisors (568823).

40381321 is an equidigital number, since it uses as much as digits as its factorization.

40381321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568822.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40381321 is about 6354.6298869407. The cubic root of 40381321 is about 343.0785037356.

Adding to 40381321 its reverse (12318304), we get a palindrome (52699625).

The spelling of 40381321 in words is "forty million, three hundred eighty-one thousand, three hundred twenty-one".