1656138 has 32 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 479600.

The previous prime is 1656131. The next prime is 1656163. The reversal of 1656138 is 8316561.

It is not an unprimeable number, because it can be changed into a prime (1656131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (117936).

2^1656138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1886976).

1656138 is an abundant number, since it is smaller than the sum of its proper divisors (2117814).

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

1656138 is a wasteful number, since it uses less digits than its factorization.

1656138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its digits is 4320, while the sum is 30.

The square root of 1656138 is about 1286.9102532811. The cubic root of 1656138 is about 118.3129202815.

The spelling of 1656138 in words is "one million, six hundred fifty-six thousand, one hundred thirty-eight".