1421257 has 12 divisors (see below), whose sum is σ = 1560576. Its totient is φ = 1292760.

The previous prime is 1421249. The next prime is 1421267. The reversal of 1421257 is 7521241.

It is a happy number.

It is not a de Polignac number, because 1421257 - 2³ = 1421249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421227) 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 11 ways as a sum of consecutive naturals, for example, 11128 + ... + 11254.

It is an arithmetic number, because the mean of its divisors is an integer number (130048).

2^1421257 is an apocalyptic number.

It is an amenable number.

1421257 is a deficient number, since it is larger than the sum of its proper divisors (139319).

1421257 is a wasteful number, since it uses less digits than its factorization.

1421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 177 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 1421257 is about 1192.1648375959. The cubic root of 1421257 is about 112.4322423260.

Adding to 1421257 its reverse (7521241), we get a palindrome (8942498).

The spelling of 1421257 in words is "one million, four hundred twenty-one thousand, two hundred fifty-seven".