1666738 has 8 divisors (see below), whose sum is σ = 2517120. Its totient is φ = 827700.

The previous prime is 1666733. The next prime is 1666757. The reversal of 1666738 is 8376661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1666697 and 1666706.

It is not an unprimeable number, because it can be changed into a prime (1666733) 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, 2458 + ... + 3061.

It is an arithmetic number, because the mean of its divisors is an integer number (314640).

2^1666738 is an apocalyptic number.

1666738 is a deficient number, since it is larger than the sum of its proper divisors (850382).

1666738 is a wasteful number, since it uses less digits than its factorization.

1666738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672.

The product of its digits is 36288, while the sum is 37.

The square root of 1666738 is about 1291.0220757214. The cubic root of 1666738 is about 118.5648016259.

The spelling of 1666738 in words is "one million, six hundred sixty-six thousand, seven hundred thirty-eight".