642433403 has 2 divisors, whose sum is σ = 642433404. Its totient is φ = 642433402.

The previous prime is 642433369. The next prime is 642433409. The reversal of 642433403 is 304334246.

642433403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642433403 - 2⁸ = 642433147 is a prime.

It is not a weakly prime, because it can be changed into another prime (642433409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321216701 + 321216702.

It is an arithmetic number, because the mean of its divisors is an integer number (321216702).

Almost surely, 2^642433403 is an apocalyptic number.

642433403 is a deficient number, since it is larger than the sum of its proper divisors (1).

642433403 is an equidigital number, since it uses as much as digits as its factorization.

642433403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 29.

The square root of 642433403 is about 25346.2700017182. The cubic root of 642433403 is about 862.8647046316.

Adding to 642433403 its reverse (304334246), we get a palindrome (946767649).

The spelling of 642433403 in words is "six hundred forty-two million, four hundred thirty-three thousand, four hundred three".