2151898 has 16 divisors (see below), whose sum is σ = 3708864. Its totient is φ = 917280.

The previous prime is 2151869. The next prime is 2151899. The reversal of 2151898 is 8981512.

2151898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2151899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3661 + ... + 4207.

It is an arithmetic number, because the mean of its divisors is an integer number (231804).

2^2151898 is an apocalyptic number.

2151898 is a deficient number, since it is larger than the sum of its proper divisors (1556966).

2151898 is a wasteful number, since it uses less digits than its factorization.

2151898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 5760, while the sum is 34.

The square root of 2151898 is about 1466.9348997144. The cubic root of 2151898 is about 129.1042564031.

The spelling of 2151898 in words is "two million, one hundred fifty-one thousand, eight hundred ninety-eight".