2155486 has 4 divisors (see below), whose sum is σ = 3233232. Its totient is φ = 1077742.

The previous prime is 2155477. The next prime is 2155487. The reversal of 2155486 is 6845512.

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

It is a super-2 number, since 2×2155486² = 9292239792392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538870 + ... + 538873.

It is an arithmetic number, because the mean of its divisors is an integer number (808308).

2^2155486 is an apocalyptic number.

2155486 is a deficient number, since it is larger than the sum of its proper divisors (1077746).

2155486 is a wasteful number, since it uses less digits than its factorization.

2155486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077745.

The product of its digits is 9600, while the sum is 31.

The square root of 2155486 is about 1468.1573485155. The cubic root of 2155486 is about 129.1759712109.

The spelling of 2155486 in words is "two million, one hundred fifty-five thousand, four hundred eighty-six".