1911421 has 4 divisors (see below), whose sum is σ = 1926144. Its totient is φ = 1896700.

The previous prime is 1911401. The next prime is 1911433. The reversal of 1911421 is 1241191.

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 a cyclic number.

It is not a de Polignac number, because 1911421 - 2¹¹ = 1909373 is a prime.

It is an Ulam number.

It is a Duffinian number.

1911421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911401) 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 3 ways as a sum of consecutive naturals, for example, 7165 + ... + 7426.

It is an arithmetic number, because the mean of its divisors is an integer number (481536).

2^1911421 is an apocalyptic number.

It is an amenable number.

1911421 is a deficient number, since it is larger than the sum of its proper divisors (14723).

1911421 is a wasteful number, since it uses less digits than its factorization.

1911421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14722.

The product of its digits is 72, while the sum is 19.

The square root of 1911421 is about 1382.5415002813. The cubic root of 1911421 is about 124.1039061435.

It can be divided in two parts, 1911 and 421, that added together give a palindrome (2332).

The spelling of 1911421 in words is "one million, nine hundred eleven thousand, four hundred twenty-one".