2138824 has 8 divisors (see below), whose sum is σ = 4010310. Its totient is φ = 1069408.

The previous prime is 2138813. The next prime is 2138831. The reversal of 2138824 is 4288312.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 1036324 = 1050^2 + 1018^2 .

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2138792 and 2138801.

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 as a sum of consecutive naturals, namely, 133669 + ... + 133684.

2^2138824 is an apocalyptic number.

It is an amenable number.

2138824 is a deficient number, since it is larger than the sum of its proper divisors (1871486).

2138824 is a wasteful number, since it uses less digits than its factorization.

2138824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267359 (or 267355 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 2138824 is about 1462.4718800715. The cubic root of 2138824 is about 128.8422645912.

It can be divided in two parts, 21388 and 24, that added together give a palindrome (21412).

The spelling of 2138824 in words is "two million, one hundred thirty-eight thousand, eight hundred twenty-four".