2157258 has 16 divisors (see below), whose sum is σ = 4334400. Its totient is φ = 715776.

The previous prime is 2157257. The next prime is 2157269. The reversal of 2157258 is 8527512.

It is not an unprimeable number, because it can be changed into a prime (2157251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (270900).

2^2157258 is an apocalyptic number.

2157258 is an abundant number, since it is smaller than the sum of its proper divisors (2177142).

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

2157258 is a wasteful number, since it uses less digits than its factorization.

2157258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661.

The product of its digits is 5600, while the sum is 30.

The square root of 2157258 is about 1468.7607020887. The cubic root of 2157258 is about 129.2113595370.

It can be divided in two parts, 2157 and 258, that added together give a triangular number (2415 = T₆₉).

The spelling of 2157258 in words is "two million, one hundred fifty-seven thousand, two hundred fifty-eight".