2151894 has 32 divisors (see below), whose sum is σ = 4635360. Its totient is φ = 665856.

The previous prime is 2151869. The next prime is 2151899. The reversal of 2151894 is 4981512.

It is a happy number.

2151894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 29442 + ... + 29514.

It is an arithmetic number, because the mean of its divisors is an integer number (144855).

2^2151894 is an apocalyptic number.

2151894 is an abundant number, since it is smaller than the sum of its proper divisors (2483466).

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

2151894 is an equidigital number, since it uses as much as digits as its factorization.

2151894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 95 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 2151894 is about 1466.9335363267. The cubic root of 2151894 is about 129.1041764090.

It can be divided in two parts, 21518 and 94, that added together give a palindrome (21612).

The spelling of 2151894 in words is "two million, one hundred fifty-one thousand, eight hundred ninety-four".