2151938 has 8 divisors (see below), whose sum is σ = 3246480. Its totient is φ = 1069780.

The previous prime is 2151923. The next prime is 2151943. The reversal of 2151938 is 8391512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2151938.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648 + ... + 3363.

It is an arithmetic number, because the mean of its divisors is an integer number (405810).

2^2151938 is an apocalyptic number.

2151938 is a deficient number, since it is larger than the sum of its proper divisors (1094542).

2151938 is a wasteful number, since it uses less digits than its factorization.

2151938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6192.

The product of its digits is 2160, while the sum is 29.

The square root of 2151938 is about 1466.9485335212. The cubic root of 2151938 is about 129.1050563385.

The spelling of 2151938 in words is "two million, one hundred fifty-one thousand, nine hundred thirty-eight".