1987926684 has 48 divisors (see below), whose sum is σ = 4810864800. Its totient is φ = 638136576.

The previous prime is 1987926683. The next prime is 1987926719. The reversal of 1987926684 is 4866297891.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987926683) 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 15 ways as a sum of consecutive naturals, for example, 130962 + ... + 145350.

It is an arithmetic number, because the mean of its divisors is an integer number (100226350).

Almost surely, 2^1987926684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987926684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2405432400).

1987926684 is an abundant number, since it is smaller than the sum of its proper divisors (2822938116).

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

1987926684 is a wasteful number, since it uses less digits than its factorization.

1987926684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14822 (or 14820 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The square root of 1987926684 is about 44586.1714436214. The cubic root of 1987926684 is about 1257.3806937680.

The spelling of 1987926684 in words is "one billion, nine hundred eighty-seven million, nine hundred twenty-six thousand, six hundred eighty-four".