2138566 has 16 divisors (see below), whose sum is σ = 3507840. Its totient is φ = 973440.

The previous prime is 2138551. The next prime is 2138569. The reversal of 2138566 is 6658312.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40 + ... + 2068.

It is an arithmetic number, because the mean of its divisors is an integer number (219240).

2^2138566 is an apocalyptic number.

2138566 is a deficient number, since it is larger than the sum of its proper divisors (1369274).

2138566 is a wasteful number, since it uses less digits than its factorization.

2138566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079.

The product of its digits is 8640, while the sum is 31.

The square root of 2138566 is about 1462.3836705872. The cubic root of 2138566 is about 128.8370837627.

2138566 divided by its sum of digits (31) gives a palindrome (68986).

It can be divided in two parts, 2138 and 566, that added together give a square (2704 = 52²).

The spelling of 2138566 in words is "two million, one hundred thirty-eight thousand, five hundred sixty-six".