1987649118 has 224 divisors, whose sum is σ = 5605673472. Its totient is φ = 514382400.

The previous prime is 1987649113. The next prime is 1987649119. The reversal of 1987649118 is 8119467891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987649113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 9420033 + ... + 9420243.

It is an arithmetic number, because the mean of its divisors is an integer number (25025328).

Almost surely, 2^1987649118 is an apocalyptic number.

1987649118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987649118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2802836736).

1987649118 is an abundant number, since it is smaller than the sum of its proper divisors (3618024354).

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

1987649118 is a wasteful number, since it uses less digits than its factorization.

1987649118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 307 counting only the distinct ones).

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

The square root of 1987649118 is about 44583.0586433905. The cubic root of 1987649118 is about 1257.3221700848.

The spelling of 1987649118 in words is "one billion, nine hundred eighty-seven million, six hundred forty-nine thousand, one hundred eighteen".