2166738 has 32 divisors (see below), whose sum is σ = 5170176. Its totient is φ = 591888.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166738 is 8376612.

It is a junction number, because it is equal to n+sod(n) for n = 2166699 and 2166708.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156 + ... + 2087.

It is an arithmetic number, because the mean of its divisors is an integer number (161568).

2^2166738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2585088).

2166738 is an abundant number, since it is smaller than the sum of its proper divisors (3003438).

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

2166738 is a wasteful number, since it uses less digits than its factorization.

2166738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its digits is 12096, while the sum is 33.

The square root of 2166738 is about 1471.9843749171. The cubic root of 2166738 is about 129.4003546657.

The spelling of 2166738 in words is "two million, one hundred sixty-six thousand, seven hundred thirty-eight".