1987361990 has 16 divisors (see below), whose sum is σ = 3617447040. Its totient is φ = 786012480.

The previous prime is 1987361983. The next prime is 1987361993. The reversal of 1987361990 is 991637891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987361993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115606 + ... + 1117385.

It is an arithmetic number, because the mean of its divisors is an integer number (226090440).

Almost surely, 2^1987361990 is an apocalyptic number.

1987361990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987361990 is a deficient number, since it is larger than the sum of its proper divisors (1630085050).

1987361990 is a wasteful number, since it uses less digits than its factorization.

1987361990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233087.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 1987361990 is about 44579.8383801467. The cubic root of 1987361990 is about 1257.2616245587.

The spelling of 1987361990 in words is "one billion, nine hundred eighty-seven million, three hundred sixty-one thousand, nine hundred ninety".