1721956142 has 16 divisors (see below), whose sum is σ = 2677622400. Its totient is φ = 829540320.

The previous prime is 1721956109. The next prime is 1721956147. The reversal of 1721956142 is 2416591271.

It is a junction number, because it is equal to n+sod(n) for n = 1721956096 and 1721956105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721956147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3209 + ... + 58772.

It is an arithmetic number, because the mean of its divisors is an integer number (167351400).

Almost surely, 2^1721956142 is an apocalyptic number.

1721956142 is a deficient number, since it is larger than the sum of its proper divisors (955666258).

1721956142 is a wasteful number, since it uses less digits than its factorization.

1721956142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62491.

The product of its digits is 30240, while the sum is 38.

The square root of 1721956142 is about 41496.4593911336. The cubic root of 1721956142 is about 1198.5993245226.

The spelling of 1721956142 in words is "one billion, seven hundred twenty-one million, nine hundred fifty-six thousand, one hundred forty-two".