1891423 has 4 divisors (see below), whose sum is σ = 1894288. Its totient is φ = 1888560.

The previous prime is 1891391. The next prime is 1891429. The reversal of 1891423 is 3241981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1891423 - 2⁵ = 1891391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1891391 and 1891400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891429) 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, 118 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (473572).

2^1891423 is an apocalyptic number.

1891423 is a deficient number, since it is larger than the sum of its proper divisors (2865).

1891423 is a wasteful number, since it uses less digits than its factorization.

1891423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864.

The product of its digits is 1728, while the sum is 28.

The square root of 1891423 is about 1375.2901512045. The cubic root of 1891423 is about 123.6695807814.

The spelling of 1891423 in words is "one million, eight hundred ninety-one thousand, four hundred twenty-three".