2148391 has 4 divisors (see below), whose sum is σ = 2455312. Its totient is φ = 1841472.

The previous prime is 2148383. The next prime is 2148397. The reversal of 2148391 is 1938412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2148391 - 2³ = 2148383 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 (2148397) 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, 153450 + ... + 153463.

It is an arithmetic number, because the mean of its divisors is an integer number (613828).

2^2148391 is an apocalyptic number.

2148391 is a deficient number, since it is larger than the sum of its proper divisors (306921).

2148391 is an equidigital number, since it uses as much as digits as its factorization.

2148391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306920.

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

The square root of 2148391 is about 1465.7390627257. The cubic root of 2148391 is about 129.0340834964.

It can be divided in two parts, 214839 and 1, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 2148391 in words is "two million, one hundred forty-eight thousand, three hundred ninety-one".