1386631887 has 4 divisors (see below), whose sum is σ = 1848842520. Its totient is φ = 924421256.

The previous prime is 1386631789. The next prime is 1386631921. The reversal of 1386631887 is 7881366831.

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 1386631887 - 2¹⁰ = 1386630863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386631087) 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, 231105312 + ... + 231105317.

It is an arithmetic number, because the mean of its divisors is an integer number (462210630).

Almost surely, 2^1386631887 is an apocalyptic number.

1386631887 is a deficient number, since it is larger than the sum of its proper divisors (462210633).

1386631887 is an equidigital number, since it uses as much as digits as its factorization.

1386631887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462210632.

The product of its digits is 1161216, while the sum is 51.

The square root of 1386631887 is about 37237.5064551857. The cubic root of 1386631887 is about 1115.1168912288.

It can be divided in two parts, 13866 and 31887, that added together give a triangular number (45753 = T₃₀₂).

The spelling of 1386631887 in words is "one billion, three hundred eighty-six million, six hundred thirty-one thousand, eight hundred eighty-seven".