2156493 has 16 divisors (see below), whose sum is σ = 2995520. Its totient is φ = 1378944.

The previous prime is 2156491. The next prime is 2156507. The reversal of 2156493 is 3946512.

It is not a de Polignac number, because 2156493 - 2¹ = 2156491 is a prime.

It is the 1469-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156491) by changing a digit.

It is a nontrivial repunit in base 1468.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9303 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (187220).

2^2156493 is an apocalyptic number.

It is an amenable number.

2156493 is a deficient number, since it is larger than the sum of its proper divisors (839027).

2156493 is a wasteful number, since it uses less digits than its factorization.

2156493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 6480, while the sum is 30.

The square root of 2156493 is about 1468.5002553626. The cubic root of 2156493 is about 129.1960842235.

The spelling of 2156493 in words is "two million, one hundred fifty-six thousand, four hundred ninety-three".