1387779545 has 4 divisors (see below), whose sum is σ = 1665335460. Its totient is φ = 1110223632.

The previous prime is 1387779529. The next prime is 1387779559. The reversal of 1387779545 is 5459777831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5459777831 = 37 ⋅147561563.

It can be written as a sum of positive squares in 2 ways, for example, as 562021849 + 825757696 = 23707^2 + 28736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387779545 - 2⁴ = 1387779529 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138777950 + ... + 138777959.

It is an arithmetic number, because the mean of its divisors is an integer number (416333865).

Almost surely, 2^1387779545 is an apocalyptic number.

It is an amenable number.

1387779545 is a deficient number, since it is larger than the sum of its proper divisors (277555915).

1387779545 is an equidigital number, since it uses as much as digits as its factorization.

1387779545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277555914.

The product of its digits is 7408800, while the sum is 56.

The square root of 1387779545 is about 37252.9132417855. The cubic root of 1387779545 is about 1115.4244518063.

The spelling of 1387779545 in words is "one billion, three hundred eighty-seven million, seven hundred seventy-nine thousand, five hundred forty-five".