2151858 has 32 divisors (see below), whose sum is σ = 4536000. Its totient is φ = 679616.

The previous prime is 2151847. The next prime is 2151869. The reversal of 2151858 is 8581512.

It is an interprime number because it is at equal distance from previous prime (2151847) and next prime (2151869).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14368 + ... + 14516.

It is an arithmetic number, because the mean of its divisors is an integer number (141750).

2^2151858 is an apocalyptic number.

2151858 is an abundant number, since it is smaller than the sum of its proper divisors (2384142).

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

2151858 is a wasteful number, since it uses less digits than its factorization.

2151858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its digits is 3200, while the sum is 30.

The square root of 2151858 is about 1466.9212657808. The cubic root of 2151858 is about 129.1034564577.

The spelling of 2151858 in words is "two million, one hundred fifty-one thousand, eight hundred fifty-eight".