1387178745 has 16 divisors (see below), whose sum is σ = 2220513792. Its totient is φ = 739486080.

The previous prime is 1387178719. The next prime is 1387178773. The reversal of 1387178745 is 5478717831.

It is not a de Polignac number, because 1387178745 - 2⁵ = 1387178713 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13944 + ... + 54486.

It is an arithmetic number, because the mean of its divisors is an integer number (138782112).

Almost surely, 2^1387178745 is an apocalyptic number.

1387178745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387178745 is a deficient number, since it is larger than the sum of its proper divisors (833335047).

1387178745 is a wasteful number, since it uses less digits than its factorization.

1387178745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42832.

The product of its digits is 1317120, while the sum is 51.

The square root of 1387178745 is about 37244.8485699700. The cubic root of 1387178745 is about 1115.2634647236.

The spelling of 1387178745 in words is "one billion, three hundred eighty-seven million, one hundred seventy-eight thousand, seven hundred forty-five".