1379255987 has 4 divisors (see below), whose sum is σ = 1380100176. Its totient is φ = 1378411800.

The previous prime is 1379255981. The next prime is 1379255989. The reversal of 1379255987 is 7895529731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1379255987 - 2¹⁰ = 1379254963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379255981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419639 + ... + 422912.

It is an arithmetic number, because the mean of its divisors is an integer number (345025044).

Almost surely, 2^1379255987 is an apocalyptic number.

1379255987 is a deficient number, since it is larger than the sum of its proper divisors (844189).

1379255987 is an equidigital number, since it uses as much as digits as its factorization.

1379255987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844188.

The product of its digits is 4762800, while the sum is 56.

The square root of 1379255987 is about 37138.3358135499. The cubic root of 1379255987 is about 1113.1361642324.

The spelling of 1379255987 in words is "one billion, three hundred seventy-nine million, two hundred fifty-five thousand, nine hundred eighty-seven".