1987388011 has 24 divisors (see below), whose sum is σ = 2479513680. Its totient is φ = 1583330112.

The previous prime is 1987387999. The next prime is 1987388027. The reversal of 1987388011 is 1108837891.

It is not a de Polignac number, because 1987388011 - 2¹¹ = 1987385963 is a prime.

It is a super-2 number, since 2×1987388011² = 7899422212533072242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1987398011) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 29205 + ... + 69481.

It is an arithmetic number, because the mean of its divisors is an integer number (103313070).

Almost surely, 2^1987388011 is an apocalyptic number.

1987388011 is a deficient number, since it is larger than the sum of its proper divisors (492125669).

1987388011 is a wasteful number, since it uses less digits than its factorization.

1987388011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40363 (or 40356 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 46.

The square root of 1987388011 is about 44580.1302263688. The cubic root of 1987388011 is about 1257.2671117425.

The spelling of 1987388011 in words is "one billion, nine hundred eighty-seven million, three hundred eighty-eight thousand, eleven".