1649811798 has 24 divisors (see below), whose sum is σ = 3697855200. Its totient is φ = 530973744.

The previous prime is 1649811797. The next prime is 1649811799. The reversal of 1649811798 is 8971189461.

It is an interprime number because it is at equal distance from previous prime (1649811797) and next prime (1649811799).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649811797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1579758 + ... + 1580801.

It is an arithmetic number, because the mean of its divisors is an integer number (154077300).

Almost surely, 2^1649811798 is an apocalyptic number.

1649811798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1649811798 is an abundant number, since it is smaller than the sum of its proper divisors (2048043402).

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

1649811798 is a wasteful number, since it uses less digits than its factorization.

1649811798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160596 (or 3160593 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 1649811798 is about 40617.8753506384. The cubic root of 1649811798 is about 1181.6208211112.

The spelling of 1649811798 in words is "one billion, six hundred forty-nine million, eight hundred eleven thousand, seven hundred ninety-eight".