1723206989 has 32 divisors (see below), whose sum is σ = 2181758976. Its totient is φ = 1326124800.

The previous prime is 1723206971. The next prime is 1723206997. The reversal of 1723206989 is 9896023271.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1723206989 is a prime.

It is a super-2 number, since 2×1723206989² = 5938884653876892242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1723206389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1496564 + ... + 1497714.

It is an arithmetic number, because the mean of its divisors is an integer number (68179968).

Almost surely, 2^1723206989 is an apocalyptic number.

It is an amenable number.

1723206989 is a deficient number, since it is larger than the sum of its proper divisors (458551987).

1723206989 is a wasteful number, since it uses less digits than its factorization.

1723206989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1723206989 is about 41511.5283867024. The cubic root of 1723206989 is about 1198.8894793165.

The spelling of 1723206989 in words is "one billion, seven hundred twenty-three million, two hundred six thousand, nine hundred eighty-nine".