1721172642 has 32 divisors (see below), whose sum is σ = 3972314112. Its totient is φ = 486987984.

The previous prime is 1721172617. The next prime is 1721172647. The reversal of 1721172642 is 2462711271.

It is not an unprimeable number, because it can be changed into a prime (1721172647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 194608 + ... + 203259.

It is an arithmetic number, because the mean of its divisors is an integer number (124134816).

Almost surely, 2^1721172642 is an apocalyptic number.

1721172642 is an abundant number, since it is smaller than the sum of its proper divisors (2251141470).

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

1721172642 is a wasteful number, since it uses less digits than its factorization.

1721172642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397982.

The product of its digits is 9408, while the sum is 33.

The square root of 1721172642 is about 41487.0177525452. The cubic root of 1721172642 is about 1198.4175070697.

The spelling of 1721172642 in words is "one billion, seven hundred twenty-one million, one hundred seventy-two thousand, six hundred forty-two".