1720972 has 12 divisors (see below), whose sum is σ = 3285576. Its totient is φ = 782240.

The previous prime is 1720951. The next prime is 1720973. The reversal of 1720972 is 2790271.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720972.

It is not an unprimeable number, because it can be changed into a prime (1720973) 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, 19513 + ... + 19600.

It is an arithmetic number, because the mean of its divisors is an integer number (273798).

2^1720972 is an apocalyptic number.

It is an amenable number.

1720972 is a deficient number, since it is larger than the sum of its proper divisors (1564604).

1720972 is a wasteful number, since it uses less digits than its factorization.

1720972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39128 (or 39126 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1720972 is about 1311.8582240471. The cubic root of 1720972 is about 119.8370937612.

The spelling of 1720972 in words is "one million, seven hundred twenty thousand, nine hundred seventy-two".