1729977649 has 3 divisors (see below), whose sum is σ = 1730019243. Its totient is φ = 1729936056.

The previous prime is 1729977583. The next prime is 1729977653. The reversal of 1729977649 is 9467799271.

The square root of 1729977649 is 41593.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 333610225 + 1396367424 = 18265^2 + 37368^2 .

It is not a de Polignac number, because 1729977649 - 2⁷ = 1729977521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1729977149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20797 + ... + 62389.

It is an arithmetic number, because the mean of its divisors is an integer number (576673081).

Almost surely, 2^1729977649 is an apocalyptic number.

1729977649 is the 41593-rd square number.

1729977649 is the 20797-th centered octagonal number.

It is an amenable number.

1729977649 is a deficient number, since it is larger than the sum of its proper divisors (41594).

1729977649 is an frugal number, since it uses more digits than its factorization.

1729977649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83186 (or 41593 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 61.

The cubic root of 1729977649 is about 1200.4576145889.

The spelling of 1729977649 in words is "one billion, seven hundred twenty-nine million, nine hundred seventy-seven thousand, six hundred forty-nine".