1721689254 has 48 divisors (see below), whose sum is σ = 3894043920. Its totient is φ = 549218880.

The previous prime is 1721689241. The next prime is 1721689267. The reversal of 1721689254 is 4529861271.

It is an interprime number because it is at equal distance from previous prime (1721689241) and next prime (1721689267).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 19437 + ... + 61815.

It is an arithmetic number, because the mean of its divisors is an integer number (81125915).

Almost surely, 2^1721689254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721689254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947021960).

1721689254 is an abundant number, since it is smaller than the sum of its proper divisors (2172354666).

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

1721689254 is a wasteful number, since it uses less digits than its factorization.

1721689254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42485 (or 42482 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1721689254 is about 41493.2434740886. The cubic root of 1721689254 is about 1198.5373972185.

The spelling of 1721689254 in words is "one billion, seven hundred twenty-one million, six hundred eighty-nine thousand, two hundred fifty-four".