1987406065 has 8 divisors (see below), whose sum is σ = 2391762240. Its totient is φ = 1585341552.

The previous prime is 1987406039. The next prime is 1987406087. The reversal of 1987406065 is 5606047891.

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 1987406065 - 2¹⁹ = 1986881777 is a prime.

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, 571005 + ... + 574474.

It is an arithmetic number, because the mean of its divisors is an integer number (298970280).

Almost surely, 2^1987406065 is an apocalyptic number.

It is an amenable number.

1987406065 is a deficient number, since it is larger than the sum of its proper divisors (404356175).

1987406065 is a wasteful number, since it uses less digits than its factorization.

1987406065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145831.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 1987406065 is about 44580.3327152232. The cubic root of 1987406065 is about 1257.2709188555.

The spelling of 1987406065 in words is "one billion, nine hundred eighty-seven million, four hundred six thousand, sixty-five".