2157558 has 32 divisors (see below), whose sum is σ = 4704000. Its totient is φ = 655776.

The previous prime is 2157557. The next prime is 2157559. The reversal of 2157558 is 8557512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2157557) and next prime (2157559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10743 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (147000).

2^2157558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2352000).

2157558 is an abundant number, since it is smaller than the sum of its proper divisors (2546442).

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

2157558 is a wasteful number, since it uses less digits than its factorization.

2157558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356.

The product of its digits is 14000, while the sum is 33.

The square root of 2157558 is about 1468.8628254538. The cubic root of 2157558 is about 129.2173488702.

The spelling of 2157558 in words is "two million, one hundred fifty-seven thousand, five hundred fifty-eight".