1681224 has 16 divisors (see below), whose sum is σ = 4203120. Its totient is φ = 560400.

The previous prime is 1681219. The next prime is 1681241. The reversal of 1681224 is 4221861.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 70051 = 1681224 / (1 + 6 + 8 + 1 + 2 + 2 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1681194 and 1681203.

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, 35002 + ... + 35049.

It is an arithmetic number, because the mean of its divisors is an integer number (262695).

2^1681224 is an apocalyptic number.

It is an amenable number.

1681224 is an abundant number, since it is smaller than the sum of its proper divisors (2521896).

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

1681224 is a wasteful number, since it uses less digits than its factorization.

1681224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70060 (or 70056 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 1681224 is about 1296.6202219617. The cubic root of 1681224 is about 118.9073025248.

It can be divided in two parts, 16812 and 24, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 1681224 in words is "one million, six hundred eighty-one thousand, two hundred twenty-four".