1987949808 has 120 divisors (see below), whose sum is σ = 6344000208. Its totient is φ = 575686656.

The previous prime is 1987949807. The next prime is 1987949833. The reversal of 1987949808 is 8089497891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987949807) 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 23 ways as a sum of consecutive naturals, for example, 591 + ... + 63057.

Almost surely, 2^1987949808 is an apocalyptic number.

1987949808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987949808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3172000104).

1987949808 is an abundant number, since it is smaller than the sum of its proper divisors (4356050400).

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

1987949808 is a wasteful number, since it uses less digits than its factorization.

1987949808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62511 (or 62502 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The square root of 1987949808 is about 44586.4307609389. The cubic root of 1987949808 is about 1257.3855691253.

The spelling of 1987949808 in words is "one billion, nine hundred eighty-seven million, nine hundred forty-nine thousand, eight hundred eight".