2122987 has 4 divisors (see below), whose sum is σ = 2142936. Its totient is φ = 2103040.

The previous prime is 2122979. The next prime is 2123027. The reversal of 2122987 is 7892212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2122987 - 2³ = 2122979 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2122937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9814 + ... + 10027.

It is an arithmetic number, because the mean of its divisors is an integer number (535734).

2^2122987 is an apocalyptic number.

2122987 is a deficient number, since it is larger than the sum of its proper divisors (19949).

2122987 is a wasteful number, since it uses less digits than its factorization.

2122987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19948.

The product of its digits is 4032, while the sum is 31.

The square root of 2122987 is about 1457.0473568145. The cubic root of 2122987 is about 128.5234707086.

It can be divided in two parts, 21229 and 87, that added together give a square (21316 = 146²).

The spelling of 2122987 in words is "two million, one hundred twenty-two thousand, nine hundred eighty-seven".