2151444 has 12 divisors (see below), whose sum is σ = 5020064. Its totient is φ = 717144.

The previous prime is 2151433. The next prime is 2151451. The reversal of 2151444 is 4441512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2151444² = 9257422570272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151444.

It is a congruent number.

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, 89632 + ... + 89655.

2^2151444 is an apocalyptic number.

It is an amenable number.

2151444 is an abundant number, since it is smaller than the sum of its proper divisors (2868620).

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

2151444 is a wasteful number, since it uses less digits than its factorization.

2151444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179294 (or 179292 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 2151444 is about 1466.7801471250. The cubic root of 2151444 is about 129.0951764413.

Adding to 2151444 its reverse (4441512), we get a palindrome (6592956).

The spelling of 2151444 in words is "two million, one hundred fifty-one thousand, four hundred forty-four".