1232421 has 4 divisors (see below), whose sum is σ = 1643232. Its totient is φ = 821612.

The previous prime is 1232417. The next prime is 1232431. The reversal of 1232421 is 1242321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1242321 = 3 ⋅414107.

It is a cyclic number.

It is not a de Polignac number, because 1232421 - 2² = 1232417 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1232421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1232401) 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, 205401 + ... + 205406.

It is an arithmetic number, because the mean of its divisors is an integer number (410808).

2^1232421 is an apocalyptic number.

It is an amenable number.

1232421 is a deficient number, since it is larger than the sum of its proper divisors (410811).

1232421 is an equidigital number, since it uses as much as digits as its factorization.

1232421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410810.

The product of its digits is 96, while the sum is 15.

The square root of 1232421 is about 1110.1445851780. The cubic root of 1232421 is about 107.2143778981.

Adding to 1232421 its reverse (1242321), we get a palindrome (2474742).

It can be divided in two parts, 1232 and 421, that added together give a triangular number (1653 = T₅₇).

The spelling of 1232421 in words is "one million, two hundred thirty-two thousand, four hundred twenty-one".