It is a tau number, because it is divible by the number of its divisors (12).
It is an unprimeable number.
21401636 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1401636 is a wasteful number, since it uses less digits than its factorization.
1401636 is an odious number, because the sum of its binary digits is odd.
The square root of 1401636 is about 1183.9070909493. The cubic root of 1401636 is about 111.9124528433.
Adding to 1401636 its reverse (6361041), we get a palindrome (7762677).
The spelling of 1401636 in words is "one million, four hundred one thousand, six hundred thirty-six".