1720430894 has 16 divisors (see below), whose sum is σ = 3176180448. Its totient is φ = 680609952.

The previous prime is 1720430857. The next prime is 1720430909. The reversal of 1720430894 is 4980340271.

It is a super-2 number, since 2×1720430894² = 5919764922059278472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4726277 + ... + 4726640.

It is an arithmetic number, because the mean of its divisors is an integer number (198511278).

Almost surely, 2^1720430894 is an apocalyptic number.

1720430894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1720430894 is a deficient number, since it is larger than the sum of its proper divisors (1455749554).

1720430894 is a wasteful number, since it uses less digits than its factorization.

1720430894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452939.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1720430894 is about 41478.0772698060. The cubic root of 1720430894 is about 1198.2453276510.

The spelling of 1720430894 in words is "one billion, seven hundred twenty million, four hundred thirty thousand, eight hundred ninety-four".