2151944 has 8 divisors (see below), whose sum is σ = 4034910. Its totient is φ = 1075968.

The previous prime is 2151943. The next prime is 2151971. The reversal of 2151944 is 4491512.

It can be written as a sum of positive squares in only one way, i.e., 2067844 + 84100 = 1438^2 + 290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2151943) by changing a digit.

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 as a sum of consecutive naturals, namely, 134489 + ... + 134504.

2^2151944 is an apocalyptic number.

It is an amenable number.

2151944 is a deficient number, since it is larger than the sum of its proper divisors (1882966).

2151944 is a wasteful number, since it uses less digits than its factorization.

2151944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268999 (or 268995 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 2151944 is about 1466.9505785813. The cubic root of 2151944 is about 129.1051763279.

The spelling of 2151944 in words is "two million, one hundred fifty-one thousand, nine hundred forty-four".