1649988 has 18 divisors (see below), whose sum is σ = 4170894. Its totient is φ = 549984.

The previous prime is 1649987. The next prime is 1649993. The reversal of 1649988 is 8899461.

1649988 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in only one way, i.e., 1483524 + 166464 = 1218^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1649981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22881 + ... + 22952.

2^1649988 is an apocalyptic number.

1649988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1649988 is an abundant number, since it is smaller than the sum of its proper divisors (2520906).

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

1649988 is a wasteful number, since it uses less digits than its factorization.

1649988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45843 (or 45838 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1649988 is about 1284.5185868644. The cubic root of 1649988 is about 118.1662885816.

The spelling of 1649988 in words is "one million, six hundred forty-nine thousand, nine hundred eighty-eight".