2155412 has 24 divisors (see below), whose sum is σ = 4401600. Its totient is φ = 923160.

The previous prime is 2155409. The next prime is 2155423. The reversal of 2155412 is 2145512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587 + ... + 2157.

It is an arithmetic number, because the mean of its divisors is an integer number (183400).

2^2155412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2200800).

2155412 is an abundant number, since it is smaller than the sum of its proper divisors (2246188).

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

2155412 is a wasteful number, since it uses less digits than its factorization.

2155412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596 (or 1580 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 2155412 is about 1468.1321466408. The cubic root of 2155412 is about 129.1744929470.

The spelling of 2155412 in words is "two million, one hundred fifty-five thousand, four hundred twelve".