1421987 has 4 divisors (see below), whose sum is σ = 1625136. Its totient is φ = 1218840.

The previous prime is 1421977. The next prime is 1421989. The reversal of 1421987 is 7891241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7891241 = 97 ⋅81353.

It is not a de Polignac number, because 1421987 - 2⁸ = 1421731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421989) 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 3 ways as a sum of consecutive naturals, for example, 101564 + ... + 101577.

It is an arithmetic number, because the mean of its divisors is an integer number (406284).

2^1421987 is an apocalyptic number.

1421987 is a deficient number, since it is larger than the sum of its proper divisors (203149).

1421987 is an equidigital number, since it uses as much as digits as its factorization.

1421987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203148.

The product of its digits is 4032, while the sum is 32.

The square root of 1421987 is about 1192.4709640071. The cubic root of 1421987 is about 112.4514885493.

The spelling of 1421987 in words is "one million, four hundred twenty-one thousand, nine hundred eighty-seven".