1421631 has 10 divisors (see below), whose sum is σ = 2123792. Its totient is φ = 947700.

The previous prime is 1421627. The next prime is 1421639. The reversal of 1421631 is 1361241.

It is a happy number.

1421631 is a `hidden beast` number, since 14 + 21 + 631 = 666.

It is not a de Polignac number, because 1421631 - 2² = 1421627 is a prime.

It is a super-2 number, since 2×1421631² = 4042069400322, which contains 22 as substring.

It is a Duffinian number.

1421631 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8695 + ... + 8856.

2^1421631 is an apocalyptic number.

1421631 is a deficient number, since it is larger than the sum of its proper divisors (702161).

1421631 is an equidigital number, since it uses as much as digits as its factorization.

1421631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17563 (or 17554 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1421631 is about 1192.3216847814. The cubic root of 1421631 is about 112.4421035429.

Adding to 1421631 its reverse (1361241), we get a palindrome (2782872).

The spelling of 1421631 in words is "one million, four hundred twenty-one thousand, six hundred thirty-one".