1987351772 has 24 divisors (see below), whose sum is σ = 3975801984. Its totient is φ = 851486832.

The previous prime is 1987351747. The next prime is 1987351801. The reversal of 1987351772 is 2771537891.

It is a self number, because there is not a number n which added to its sum of digits gives 1987351772.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126623 + ... + 141449.

It is an arithmetic number, because the mean of its divisors is an integer number (165658416).

Almost surely, 2^1987351772 is an apocalyptic number.

It is an amenable number.

1987351772 is an abundant number, since it is smaller than the sum of its proper divisors (1988450212).

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

1987351772 is a wasteful number, since it uses less digits than its factorization.

1987351772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19625 (or 19623 counting only the distinct ones).

The product of its digits is 740880, while the sum is 50.

The square root of 1987351772 is about 44579.7237766229. The cubic root of 1987351772 is about 1257.2594698227.

The spelling of 1987351772 in words is "one billion, nine hundred eighty-seven million, three hundred fifty-one thousand, seven hundred seventy-two".