1649816 has 32 divisors (see below), whose sum is σ = 3745440. Its totient is φ = 665088.

The previous prime is 1649807. The next prime is 1649819. The reversal of 1649816 is 6189461.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649819) 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, 86 + ... + 1818.

It is an arithmetic number, because the mean of its divisors is an integer number (117045).

2^1649816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1872720).

1649816 is an abundant number, since it is smaller than the sum of its proper divisors (2095624).

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

1649816 is a wasteful number, since it uses less digits than its factorization.

1649816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1763 (or 1759 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 1649816 is about 1284.4516339668. The cubic root of 1649816 is about 118.1621824290.

The spelling of 1649816 in words is "one million, six hundred forty-nine thousand, eight hundred sixteen".