1986338844 has 36 divisors (see below), whose sum is σ = 5738312944. Its totient is φ = 567525312.

The previous prime is 1986338843. The next prime is 1986338873. The reversal of 1986338844 is 4488336891.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986338843) 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, 3940897 + ... + 3941400.

Almost surely, 2^1986338844 is an apocalyptic number.

1986338844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1986338844 is an abundant number, since it is smaller than the sum of its proper divisors (3751974100).

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

1986338844 is a wasteful number, since it uses less digits than its factorization.

1986338844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882314 (or 7882309 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 1986338844 is about 44568.3614686472. The cubic root of 1986338844 is about 1257.0458304519.

The spelling of 1986338844 in words is "one billion, nine hundred eighty-six million, three hundred thirty-eight thousand, eight hundred forty-four".