1643479 has 4 divisors (see below), whose sum is σ = 1651480. Its totient is φ = 1635480.

The previous prime is 1643461. The next prime is 1643491. The reversal of 1643479 is 9743461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1643479 - 2⁷ = 1643351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3684 + ... + 4105.

It is an arithmetic number, because the mean of its divisors is an integer number (412870).

2^1643479 is an apocalyptic number.

1643479 is a deficient number, since it is larger than the sum of its proper divisors (8001).

1643479 is an equidigital number, since it uses as much as digits as its factorization.

1643479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000.

The product of its digits is 18144, while the sum is 34.

The square root of 1643479 is about 1281.9824491778. The cubic root of 1643479 is about 118.0106999777.

The spelling of 1643479 in words is "one million, six hundred forty-three thousand, four hundred seventy-nine".