1721919164 has 24 divisors (see below), whose sum is σ = 3445787520. Its totient is φ = 737547696.

The previous prime is 1721919139. The next prime is 1721919179. The reversal of 1721919164 is 4619191271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35807 + ... + 68745.

It is an arithmetic number, because the mean of its divisors is an integer number (143574480).

Almost surely, 2^1721919164 is an apocalyptic number.

1721919164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1721919164 is an abundant number, since it is smaller than the sum of its proper divisors (1723868356).

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

1721919164 is a wasteful number, since it uses less digits than its factorization.

1721919164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34817 (or 34815 counting only the distinct ones).

The product of its digits is 27216, while the sum is 41.

The square root of 1721919164 is about 41496.0138326563. The cubic root of 1721919164 is about 1198.5907447216.

The spelling of 1721919164 in words is "one billion, seven hundred twenty-one million, nine hundred nineteen thousand, one hundred sixty-four".