1139678987 has 4 divisors (see below), whose sum is σ = 1158995640. Its totient is φ = 1120362336.

The previous prime is 1139678971. The next prime is 1139678999. The reversal of 1139678987 is 7898769311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7898769311 = 601 ⋅13142711.

It is a cyclic number.

It is not a de Polignac number, because 1139678987 - 2⁴ = 1139678971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 19316593 = 1139678987 / (1 + 1 + 3 + 9 + 6 + 7 + 8 + 9 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1139671987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9658238 + ... + 9658355.

It is an arithmetic number, because the mean of its divisors is an integer number (289748910).

Almost surely, 2^1139678987 is an apocalyptic number.

1139678987 is a deficient number, since it is larger than the sum of its proper divisors (19316653).

1139678987 is an equidigital number, since it uses as much as digits as its factorization.

1139678987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19316652.

The product of its digits is 4572288, while the sum is 59.

The square root of 1139678987 is about 33759.1319053082. The cubic root of 1139678987 is about 1044.5458637339.

The spelling of 1139678987 in words is "one billion, one hundred thirty-nine million, six hundred seventy-eight thousand, nine hundred eighty-seven".