1643485 has 8 divisors (see below), whose sum is σ = 2020536. Its totient is φ = 1282560.

The previous prime is 1643461. The next prime is 1643491. The reversal of 1643485 is 5843461.

1643485 = 906² + 907².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10201 + 1633284 = 101^2 + 1278^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1643485 - 2⁷ = 1643357 is a prime.

It is a Duffinian number.

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, 3804 + ... + 4213.

It is an arithmetic number, because the mean of its divisors is an integer number (252567).

2^1643485 is an apocalyptic number.

1643485 is the 907-th centered square number.

It is an amenable number.

1643485 is a deficient number, since it is larger than the sum of its proper divisors (377051).

1643485 is an equidigital number, since it uses as much as digits as its factorization.

1643485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063.

The product of its digits is 11520, while the sum is 31.

The square root of 1643485 is about 1281.9847893013. The cubic root of 1643485 is about 118.0108435884.

The spelling of 1643485 in words is "one million, six hundred forty-three thousand, four hundred eighty-five".