1987587158 has 4 divisors (see below), whose sum is σ = 2981380740. Its totient is φ = 993793578.

The previous prime is 1987587143. The next prime is 1987587191. The reversal of 1987587158 is 8517857891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8517857891 = 2861 ⋅2977231.

It is a junction number, because it is equal to n+sod(n) for n = 1987587097 and 1987587106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496896788 + ... + 496896791.

It is an arithmetic number, because the mean of its divisors is an integer number (745345185).

Almost surely, 2^1987587158 is an apocalyptic number.

1987587158 is a deficient number, since it is larger than the sum of its proper divisors (993793582).

1987587158 is an equidigital number, since it uses as much as digits as its factorization.

1987587158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993793581.

The product of its digits is 5644800, while the sum is 59.

The square root of 1987587158 is about 44582.3637551891. The cubic root of 1987587158 is about 1257.3091053223.

The spelling of 1987587158 in words is "one billion, nine hundred eighty-seven million, five hundred eighty-seven thousand, one hundred fifty-eight".