1421881 has 6 divisors (see below), whose sum is σ = 1457610. Its totient is φ = 1387008.

The previous prime is 1421867. The next prime is 1421909. The reversal of 1421881 is 1881241.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 266256 = 1075^2 + 516^2 .

It is not a de Polignac number, because 1421881 - 2¹¹ = 1419833 is a prime.

It is a super-2 number, since 2×1421881² = 4043491156322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421801) 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 in 5 ways as a sum of consecutive naturals, for example, 1465 + ... + 2233.

It is an arithmetic number, because the mean of its divisors is an integer number (242935).

2^1421881 is an apocalyptic number.

It is an amenable number.

1421881 is a deficient number, since it is larger than the sum of its proper divisors (35729).

1421881 is an frugal number, since it uses more digits than its factorization.

1421881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 812 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

The square root of 1421881 is about 1192.4265176521. The cubic root of 1421881 is about 112.4486943010.

The spelling of 1421881 in words is "one million, four hundred twenty-one thousand, eight hundred eighty-one".