2155256 has 16 divisors (see below), whose sum is σ = 4102440. Its totient is φ = 1061280.

The previous prime is 2155253. The next prime is 2155259. The reversal of 2155256 is 6525512.

It is an interprime number because it is at equal distance from previous prime (2155253) and next prime (2155259).

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 2¹³ + 1 + 5 + 5³ + 2²¹ + 5⁵ + 6⁶ .

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155253) 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, 1475 + ... + 2546.

2^2155256 is an apocalyptic number.

It is an amenable number.

2155256 is a deficient number, since it is larger than the sum of its proper divisors (1947184).

2155256 is a wasteful number, since it uses less digits than its factorization.

2155256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094 (or 4090 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 2155256 is about 1468.0790169470. The cubic root of 2155256 is about 129.1713764961.

The spelling of 2155256 in words is "two million, one hundred fifty-five thousand, two hundred fifty-six".