1649868 has 48 divisors (see below), whose sum is σ = 4354560. Its totient is φ = 481600.

The previous prime is 1649863. The next prime is 1649887. The reversal of 1649868 is 8689461.

It is not an unprimeable number, because it can be changed into a prime (1649861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3613 + ... + 4043.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1649868 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 1649868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2177280).

1649868 is an abundant number, since it is smaller than the sum of its proper divisors (2704692).

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

1649868 is a wasteful number, since it uses less digits than its factorization.

1649868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 476 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 1649868 is about 1284.4718759085. The cubic root of 1649868 is about 118.1634238540.

The spelling of 1649868 in words is "one million, six hundred forty-nine thousand, eight hundred sixty-eight".