1720388623 has 2 divisors, whose sum is σ = 1720388624. Its totient is φ = 1720388622.

The previous prime is 1720388599. The next prime is 1720388641. The reversal of 1720388623 is 3268830271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1720388623 - 2²⁹ = 1183517711 is a prime.

It is a super-2 number, since 2×1720388623² = 5919474028295672258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720388723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860194311 + 860194312.

It is an arithmetic number, because the mean of its divisors is an integer number (860194312).

Almost surely, 2^1720388623 is an apocalyptic number.

1720388623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720388623 is an equidigital number, since it uses as much as digits as its factorization.

1720388623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1720388623 is about 41477.5677083409. The cubic root of 1720388623 is about 1198.2355139384.

The spelling of 1720388623 in words is "one billion, seven hundred twenty million, three hundred eighty-eight thousand, six hundred twenty-three".