1666949 has 8 divisors (see below), whose sum is σ = 1762560. Its totient is φ = 1573936.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666949 is 9496661.

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

It is not a de Polignac number, because 1666949 - 2⁴ = 1666933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666943) 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, 752 + ... + 1974.

It is an arithmetic number, because the mean of its divisors is an integer number (220320).

2^1666949 is an apocalyptic number.

It is an amenable number.

1666949 is a deficient number, since it is larger than the sum of its proper divisors (95611).

1666949 is a wasteful number, since it uses less digits than its factorization.

1666949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its digits is 69984, while the sum is 41.

The square root of 1666949 is about 1291.1037913352. The cubic root of 1666949 is about 118.5698046353.

The spelling of 1666949 in words is "one million, six hundred sixty-six thousand, nine hundred forty-nine".