1967421 has 4 divisors (see below), whose sum is σ = 2623232. Its totient is φ = 1311612.

The previous prime is 1967419. The next prime is 1967429. The reversal of 1967421 is 1247691.

It is a happy number.

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.

It is not a de Polignac number, because 1967421 - 2¹ = 1967419 is a prime.

It is a D-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 (1967429) 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, 327901 + ... + 327906.

It is an arithmetic number, because the mean of its divisors is an integer number (655808).

2^1967421 is an apocalyptic number.

It is an amenable number.

1967421 is a deficient number, since it is larger than the sum of its proper divisors (655811).

1967421 is an equidigital number, since it uses as much as digits as its factorization.

1967421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655810.

The product of its digits is 3024, while the sum is 30.

The square root of 1967421 is about 1402.6478531691. The cubic root of 1967421 is about 125.3042402356.

The spelling of 1967421 in words is "one million, nine hundred sixty-seven thousand, four hundred twenty-one".