720517403 has 2 divisors, whose sum is σ = 720517404. Its totient is φ = 720517402.

The previous prime is 720517361. The next prime is 720517429. The reversal of 720517403 is 304715027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720517403 - 2⁶ = 720517339 is a prime.

It is not a weakly prime, because it can be changed into another prime (720517463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360258701 + 360258702.

It is an arithmetic number, because the mean of its divisors is an integer number (360258702).

Almost surely, 2^720517403 is an apocalyptic number.

720517403 is a deficient number, since it is larger than the sum of its proper divisors (1).

720517403 is an equidigital number, since it uses as much as digits as its factorization.

720517403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 720517403 is about 26842.4552341994. The cubic root of 720517403 is about 896.4955916323.

The spelling of 720517403 in words is "seven hundred twenty million, five hundred seventeen thousand, four hundred three".