1920421 has 4 divisors (see below), whose sum is σ = 1949152. Its totient is φ = 1891692.

The previous prime is 1920407. The next prime is 1920427. The reversal of 1920421 is 1240291.

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 1920421 - 2¹⁷ = 1789349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920427) 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, 14265 + ... + 14398.

It is an arithmetic number, because the mean of its divisors is an integer number (487288).

2^1920421 is an apocalyptic number.

It is an amenable number.

1920421 is a deficient number, since it is larger than the sum of its proper divisors (28731).

1920421 is an equidigital number, since it uses as much as digits as its factorization.

1920421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28730.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1920421 is about 1385.7925530179. The cubic root of 1920421 is about 124.2983839137.

The spelling of 1920421 in words is "one million, nine hundred twenty thousand, four hundred twenty-one".