1587981965 has 8 divisors (see below), whose sum is σ = 1920583680. Its totient is φ = 1260382032.

The previous prime is 1587981931. The next prime is 1587982001. The reversal of 1587981965 is 5691897851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1587981965 - 2²⁸ = 1319546509 is a prime.

It is a super-2 number, since 2×1587981965² = 5043373442330522450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1249745 + ... + 1251014.

It is an arithmetic number, because the mean of its divisors is an integer number (240072960).

Almost surely, 2^1587981965 is an apocalyptic number.

It is an amenable number.

1587981965 is a deficient number, since it is larger than the sum of its proper divisors (332601715).

1587981965 is a wasteful number, since it uses less digits than its factorization.

1587981965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500891.

The product of its digits is 5443200, while the sum is 59.

The square root of 1587981965 is about 39849.4914020242. The cubic root of 1587981965 is about 1166.6713202082.

The spelling of 1587981965 in words is "one billion, five hundred eighty-seven million, nine hundred eighty-one thousand, nine hundred sixty-five".