2157312 has 54 divisors (see below), whose sum is σ = 5851972. Its totient is φ = 705536.

The previous prime is 2157307. The next prime is 2157313. The reversal of 2157312 is 2137512.

It is not an unprimeable number, because it can be changed into a prime (2157313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40678 + ... + 40730.

2^2157312 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 2157312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2925986).

2157312 is an abundant number, since it is smaller than the sum of its proper divisors (3694660).

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

2157312 is an frugal number, since it uses more digits than its factorization.

2157312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 58 counting only the distinct ones).

The product of its digits is 420, while the sum is 21.

The square root of 2157312 is about 1468.7790848184. The cubic root of 2157312 is about 129.2124376579.

The spelling of 2157312 in words is "two million, one hundred fifty-seven thousand, three hundred twelve".