1639424 has 22 divisors (see below), whose sum is σ = 3279294. Its totient is φ = 819200.

The previous prime is 1639409. The next prime is 1639427. The reversal of 1639424 is 4249361.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 1024 = 1280^2 + 32^2 .

It is a super-2 number, since 2×1639424² = 5375422103552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1639427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224 + ... + 1824.

2^1639424 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 1639424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639647).

1639424 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1639424 is an equidigital number, since it uses as much as digits as its factorization.

1639424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1603 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 1639424 is about 1280.3999375195. The cubic root of 1639424 is about 117.9135630515.

The spelling of 1639424 in words is "one million, six hundred thirty-nine thousand, four hundred twenty-four".