1649706 has 8 divisors (see below), whose sum is σ = 3299424. Its totient is φ = 549900.

The previous prime is 1649693. The next prime is 1649707. The reversal of 1649706 is 6079461.

It is a happy number.

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

1649706 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1649707) 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, 137470 + ... + 137481.

It is an arithmetic number, because the mean of its divisors is an integer number (412428).

2^1649706 is an apocalyptic number.

1649706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1649706 is a wasteful number, since it uses less digits than its factorization.

1649706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274956.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1649706 is about 1284.4088134235. The cubic root of 1649706 is about 118.1595562515.

It can be divided in two parts, 164 and 9706, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 1649706 in words is "one million, six hundred forty-nine thousand, seven hundred six".