1721299734 has 144 divisors (see below), whose sum is σ = 4908810816. Its totient is φ = 447022800.

The previous prime is 1721299721. The next prime is 1721299757. The reversal of 1721299734 is 4379921271.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1721299734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 258669 + ... + 265239.

It is an arithmetic number, because the mean of its divisors is an integer number (34088964).

Almost surely, 2^1721299734 is an apocalyptic number.

1721299734 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721299734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2454405408).

1721299734 is an abundant number, since it is smaller than the sum of its proper divisors (3187511082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721299734 is a wasteful number, since it uses less digits than its factorization.

1721299734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6613 (or 6594 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 1721299734 is about 41488.5494323434. The cubic root of 1721299734 is about 1198.4470035353.

The spelling of 1721299734 in words is "one billion, seven hundred twenty-one million, two hundred ninety-nine thousand, seven hundred thirty-four".