1620872 has 32 divisors (see below), whose sum is σ = 3365280. Its totient is φ = 725760.

The previous prime is 1620841. The next prime is 1620881. The reversal of 1620872 is 2780261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9863 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (105165).

2^1620872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682640).

1620872 is an abundant number, since it is smaller than the sum of its proper divisors (1744408).

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

1620872 is a wasteful number, since it uses less digits than its factorization.

1620872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1620872 is about 1273.1347140032. The cubic root of 1620872 is about 117.4670980761.

The spelling of 1620872 in words is "one million, six hundred twenty thousand, eight hundred seventy-two".