2157828 has 12 divisors (see below), whose sum is σ = 5034960. Its totient is φ = 719272.

The previous prime is 2157823. The next prime is 2157833. The reversal of 2157828 is 8287512.

It is an interprime number because it is at equal distance from previous prime (2157823) and next prime (2157833).

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2157821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89898 + ... + 89921.

It is an arithmetic number, because the mean of its divisors is an integer number (419580).

2^2157828 is an apocalyptic number.

It is an amenable number.

2157828 is an abundant number, since it is smaller than the sum of its proper divisors (2877132).

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

2157828 is a wasteful number, since it uses less digits than its factorization.

2157828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179826 (or 179824 counting only the distinct ones).

The product of its digits is 8960, while the sum is 33.

The square root of 2157828 is about 1468.9547304121. The cubic root of 2157828 is about 129.2227387954. Note that the first 3 decimals are identical.

The spelling of 2157828 in words is "two million, one hundred fifty-seven thousand, eight hundred twenty-eight".