1720121272 has 16 divisors (see below), whose sum is σ = 3226847400. Its totient is φ = 859628640.

The previous prime is 1720121267. The next prime is 1720121279. The reversal of 1720121272 is 2721210271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720121279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36754 + ... + 69217.

Almost surely, 2^1720121272 is an apocalyptic number.

It is an amenable number.

1720121272 is a deficient number, since it is larger than the sum of its proper divisors (1506726128).

1720121272 is a wasteful number, since it uses less digits than its factorization.

1720121272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108006 (or 108002 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 1720121272 is about 41474.3447446732. The cubic root of 1720121272 is about 1198.1734415178.

The spelling of 1720121272 in words is "one billion, seven hundred twenty million, one hundred twenty-one thousand, two hundred seventy-two".