1421731 has 2 divisors, whose sum is σ = 1421732. Its totient is φ = 1421730.

The previous prime is 1421711. The next prime is 1421737. The reversal of 1421731 is 1371241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421731 - 2⁷ = 1421603 is a prime.

It is a super-2 number, since 2×1421731² = 4042638072722, which contains 22 as substring.

It is a Chen prime.

1421731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1421699 and 1421708.

It is not a weakly prime, because it can be changed into another prime (1421737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710865 + 710866.

It is an arithmetic number, because the mean of its divisors is an integer number (710866).

2^1421731 is an apocalyptic number.

1421731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421731 is an equidigital number, since it uses as much as digits as its factorization.

1421731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 19.

The square root of 1421731 is about 1192.3636190357. The cubic root of 1421731 is about 112.4447399389. Note that the first 3 decimals are identical.

Adding to 1421731 its reverse (1371241), we get a palindrome (2792972).

The spelling of 1421731 in words is "one million, four hundred twenty-one thousand, seven hundred thirty-one".