1638361 has 4 divisors (see below), whose sum is σ = 1641424. Its totient is φ = 1635300.

The previous prime is 1638353. The next prime is 1638431.

1638361 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 1638361 - 2³ = 1638353 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

1638361 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1638311) 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, 495 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (410356).

2^1638361 is an apocalyptic number.

It is an amenable number.

1638361 is a deficient number, since it is larger than the sum of its proper divisors (3063).

1638361 is an equidigital number, since it uses as much as digits as its factorization.

1638361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062.

The product of its digits is 2592, while the sum is 28.

The square root of 1638361 is about 1279.9847655343. The cubic root of 1638361 is about 117.8880725504. Note that the first 3 decimals are identical.

The spelling of 1638361 in words is "one million, six hundred thirty-eight thousand, three hundred sixty-one".