2154391 has 8 divisors (see below), whose sum is σ = 2286000. Its totient is φ = 2024640.

The previous prime is 2154389. The next prime is 2154413. The reversal of 2154391 is 1934512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2154391 - 2¹ = 2154389 is a prime.

It is a Duffinian number.

2154391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154311) 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 7 ways as a sum of consecutive naturals, for example, 2451 + ... + 3211.

It is an arithmetic number, because the mean of its divisors is an integer number (285750).

2^2154391 is an apocalyptic number.

2154391 is a deficient number, since it is larger than the sum of its proper divisors (131609).

2154391 is a wasteful number, since it uses less digits than its factorization.

2154391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its digits is 1080, while the sum is 25.

The square root of 2154391 is about 1467.7843847105. The cubic root of 2154391 is about 129.1540934461.

The spelling of 2154391 in words is "two million, one hundred fifty-four thousand, three hundred ninety-one".