1421897 has 4 divisors (see below), whose sum is σ = 1505556. Its totient is φ = 1338240.

The previous prime is 1421867. The next prime is 1421909. The reversal of 1421897 is 7981241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 1042441 = 616^2 + 1021^2 .

It is not a de Polignac number, because 1421897 - 2¹⁴ = 1405513 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1421857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41804 + ... + 41837.

It is an arithmetic number, because the mean of its divisors is an integer number (376389).

2^1421897 is an apocalyptic number.

1421897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1421897 is a deficient number, since it is larger than the sum of its proper divisors (83659).

1421897 is an equidigital number, since it uses as much as digits as its factorization.

1421897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83658.

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

The square root of 1421897 is about 1192.4332266421. The cubic root of 1421897 is about 112.4491160832.

The spelling of 1421897 in words is "one million, four hundred twenty-one thousand, eight hundred ninety-seven".