1375207987 has 4 divisors (see below), whose sum is σ = 1375282216. Its totient is φ = 1375133760.

The previous prime is 1375207961. The next prime is 1375207991. The reversal of 1375207987 is 7897025731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375207987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1375207987.

It is not an unprimeable number, because it can be changed into a prime (1375207997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16312 + ... + 54922.

It is an arithmetic number, because the mean of its divisors is an integer number (343820554).

Almost surely, 2^1375207987 is an apocalyptic number.

1375207987 is a deficient number, since it is larger than the sum of its proper divisors (74229).

1375207987 is an equidigital number, since it uses as much as digits as its factorization.

1375207987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74228.

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 1375207987 is about 37083.7968255679. The cubic root of 1375207987 is about 1112.0461102091.

The spelling of 1375207987 in words is "one billion, three hundred seventy-five million, two hundred seven thousand, nine hundred eighty-seven".