403221493 has 2 divisors, whose sum is σ = 403221494. Its totient is φ = 403221492.

The previous prime is 403221479. The next prime is 403221527. The reversal of 403221493 is 394122304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399920004 + 3301489 = 19998^2 + 1817^2 .

It is a cyclic number.

It is not a de Polignac number, because 403221493 - 2⁵ = 403221461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403221463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201610746 + 201610747.

It is an arithmetic number, because the mean of its divisors is an integer number (201610747).

Almost surely, 2^403221493 is an apocalyptic number.

It is an amenable number.

403221493 is a deficient number, since it is larger than the sum of its proper divisors (1).

403221493 is an equidigital number, since it uses as much as digits as its factorization.

403221493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 403221493 is about 20080.3758181962. The cubic root of 403221493 is about 738.7790268436.

Adding to 403221493 its reverse (394122304), we get a palindrome (797343797).

The spelling of 403221493 in words is "four hundred three million, two hundred twenty-one thousand, four hundred ninety-three".