1987157079 has 12 divisors (see below), whose sum is σ = 2872954656. Its totient is φ = 1323563712.

The previous prime is 1987156999. The next prime is 1987157083. The reversal of 1987157079 is 9707517891.

It is not a de Polignac number, because 1987157079 - 2¹¹ = 1987155031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987157479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90162 + ... + 110015.

It is an arithmetic number, because the mean of its divisors is an integer number (239412888).

Almost surely, 2^1987157079 is an apocalyptic number.

1987157079 is a deficient number, since it is larger than the sum of its proper divisors (885797577).

1987157079 is a wasteful number, since it uses less digits than its factorization.

1987157079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201286 (or 201283 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 54.

The square root of 1987157079 is about 44577.5400734495. The cubic root of 1987157079 is about 1257.2184122345.

The spelling of 1987157079 in words is "one billion, nine hundred eighty-seven million, one hundred fifty-seven thousand, seventy-nine".