1721274736 has 40 divisors (see below), whose sum is σ = 3485875104. Its totient is φ = 821821440.

The previous prime is 1721274703. The next prime is 1721274767. The reversal of 1721274736 is 6374721271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232240 + ... + 239536.

Almost surely, 2^1721274736 is an apocalyptic number.

1721274736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721274736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742937552).

1721274736 is an abundant number, since it is smaller than the sum of its proper divisors (1764600368).

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

1721274736 is a wasteful number, since it uses less digits than its factorization.

1721274736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7969 (or 7963 counting only the distinct ones).

The product of its digits is 98784, while the sum is 40.

The square root of 1721274736 is about 41488.2481674028. The cubic root of 1721274736 is about 1198.4412019265.

The spelling of 1721274736 in words is "one billion, seven hundred twenty-one million, two hundred seventy-four thousand, seven hundred thirty-six".