1638049 has 4 divisors (see below), whose sum is σ = 1872064. Its totient is φ = 1404036.

The previous prime is 1638031. The next prime is 1638053. The reversal of 1638049 is 9408361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9408361 = 17 ⋅553433.

It is a cyclic number.

It is not a de Polignac number, because 1638049 - 2¹¹ = 1636001 is a prime.

It is an Ulam number.

It is a Duffinian number.

1638049 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1638049.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638019) 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, 116997 + ... + 117010.

It is an arithmetic number, because the mean of its divisors is an integer number (468016).

2^1638049 is an apocalyptic number.

It is an amenable number.

1638049 is a deficient number, since it is larger than the sum of its proper divisors (234015).

1638049 is an equidigital number, since it uses as much as digits as its factorization.

1638049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234014.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1638049 is about 1279.8628832809. The cubic root of 1638049 is about 117.8805887676.

The spelling of 1638049 in words is "one million, six hundred thirty-eight thousand, forty-nine".