1993538987 has 16 divisors (see below), whose sum is σ = 2215986144. Its totient is φ = 1778112000.

The previous prime is 1993538959. The next prime is 1993538999. The reversal of 1993538987 is 7898353991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1993538987 - 2²² = 1989344683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993538927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278963 + ... + 286019.

It is an arithmetic number, because the mean of its divisors is an integer number (138499134).

Almost surely, 2^1993538987 is an apocalyptic number.

1993538987 is a deficient number, since it is larger than the sum of its proper divisors (222447157).

1993538987 is a wasteful number, since it uses less digits than its factorization.

1993538987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7550.

The product of its digits is 14696640, while the sum is 62.

The square root of 1993538987 is about 44649.0647942373. The cubic root of 1993538987 is about 1258.5628585809.

The spelling of 1993538987 in words is "one billion, nine hundred ninety-three million, five hundred thirty-eight thousand, nine hundred eighty-seven".