1423891 has 6 divisors (see below), whose sum is σ = 1656420. Its totient is φ = 1220436.

The previous prime is 1423853. The next prime is 1423897. The reversal of 1423891 is 1983241.

It is a happy number.

It is not a de Polignac number, because 1423891 - 2⁹ = 1423379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1423897) 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 5 ways as a sum of consecutive naturals, for example, 14481 + ... + 14578.

It is an arithmetic number, because the mean of its divisors is an integer number (276070).

2^1423891 is an apocalyptic number.

1423891 is a deficient number, since it is larger than the sum of its proper divisors (232529).

1423891 is an equidigital number, since it uses as much as digits as its factorization.

1423891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29073 (or 29066 counting only the distinct ones).

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

The square root of 1423891 is about 1193.2690392363. The cubic root of 1423891 is about 112.5016559427.

The spelling of 1423891 in words is "one million, four hundred twenty-three thousand, eight hundred ninety-one".