1666938 has 64 divisors (see below), whose sum is σ = 4257792. Its totient is φ = 423360.

The previous prime is 1666933. The next prime is 1666939. The reversal of 1666938 is 8396661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1666896 and 1666905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23443 + ... + 23513.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2^1666938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2128896).

1666938 is an abundant number, since it is smaller than the sum of its proper divisors (2590854).

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

1666938 is a wasteful number, since it uses less digits than its factorization.

1666938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139.

The product of its digits is 46656, while the sum is 39.

The square root of 1666938 is about 1291.0995314072. The cubic root of 1666938 is about 118.5695438253.

The spelling of 1666938 in words is "one million, six hundred sixty-six thousand, nine hundred thirty-eight".