6720403 has 2 divisors, whose sum is σ = 6720404. Its totient is φ = 6720402.

The previous prime is 6720383. The next prime is 6720407. The reversal of 6720403 is 3040276.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720403 is a prime.

It is a super-3 number, since 3×6720403³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6720407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360201 + 3360202.

It is an arithmetic number, because the mean of its divisors is an integer number (3360202).

Almost surely, 2^6720403 is an apocalyptic number.

6720403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720403 is an equidigital number, since it uses as much as digits as its factorization.

6720403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 6720403 is about 2592.3740085103. The cubic root of 6720403 is about 188.7115314203.

Adding to 6720403 its reverse (3040276), we get a palindrome (9760679).

The spelling of 6720403 in words is "six million, seven hundred twenty thousand, four hundred three".