1620144 has 30 divisors (see below), whose sum is σ = 4534556. Its totient is φ = 540000.

The previous prime is 1620133. The next prime is 1620161. The reversal of 1620144 is 4410261.

1620144 is a `hidden beast` number, since 1 + 620 + 1 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5482 + ... + 5769.

2^1620144 is an apocalyptic number.

It is an amenable number.

1620144 is an abundant number, since it is smaller than the sum of its proper divisors (2914412).

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

1620144 is a wasteful number, since it uses less digits than its factorization.

1620144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11265 (or 11256 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1620144 is about 1272.8487734213. The cubic root of 1620144 is about 117.4495090143.

It can be divided in two parts, 1620 and 144, that added together give a square (1764 = 42²).

The spelling of 1620144 in words is "one million, six hundred twenty thousand, one hundred forty-four".