1421237 has 4 divisors (see below), whose sum is σ = 1440780. Its totient is φ = 1401696.

The previous prime is 1421227. The next prime is 1421243. The reversal of 1421237 is 7321241.

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 662596 + 758641 = 814^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421237 - 2⁴ = 1421221 is a prime.

It is a super-2 number, since 2×1421237² = 4039829220338, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421227) 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, 9662 + ... + 9807.

It is an arithmetic number, because the mean of its divisors is an integer number (360195).

2^1421237 is an apocalyptic number.

It is an amenable number.

1421237 is a deficient number, since it is larger than the sum of its proper divisors (19543).

1421237 is an equidigital number, since it uses as much as digits as its factorization.

1421237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19542.

The product of its digits is 336, while the sum is 20.

The square root of 1421237 is about 1192.1564494646. The cubic root of 1421237 is about 112.4317149394.

Adding to 1421237 its reverse (7321241), we get a palindrome (8742478).

The spelling of 1421237 in words is "one million, four hundred twenty-one thousand, two hundred thirty-seven".