2155320 has 48 divisors (see below), whose sum is σ = 7005960. Its totient is φ = 574656.

The previous prime is 2155319. The next prime is 2155327. The reversal of 2155320 is 235512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 2155293 and 2155302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2634 + ... + 3353.

2^2155320 is an apocalyptic number.

2155320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155320 is an abundant number, since it is smaller than the sum of its proper divisors (4850640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155320 is a wasteful number, since it uses less digits than its factorization.

2155320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6004 (or 5997 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 2155320 is about 1468.1008139770. The cubic root of 2155320 is about 129.1726550582.

The spelling of 2155320 in words is "two million, one hundred fifty-five thousand, three hundred twenty".