1720916 has 12 divisors (see below), whose sum is σ = 3027360. Its totient is φ = 855960.

The previous prime is 1720909. The next prime is 1720931. The reversal of 1720916 is 6190271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (252280).

2^1720916 is an apocalyptic number.

It is an amenable number.

1720916 is a deficient number, since it is larger than the sum of its proper divisors (1306444).

1720916 is a wasteful number, since it uses less digits than its factorization.

1720916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254 (or 2252 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1720916 is about 1311.8368801036. The cubic root of 1720916 is about 119.8357939240.

The spelling of 1720916 in words is "one million, seven hundred twenty thousand, nine hundred sixteen".