1378252885 has 4 divisors (see below), whose sum is σ = 1653903468. Its totient is φ = 1102602304.

The previous prime is 1378252873. The next prime is 1378252907. The reversal of 1378252885 is 5882528731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 311381316 + 1066871569 = 17646^2 + 32663^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378252885 - 2¹¹ = 1378250837 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137825284 + ... + 137825293.

It is an arithmetic number, because the mean of its divisors is an integer number (413475867).

Almost surely, 2^1378252885 is an apocalyptic number.

It is an amenable number.

1378252885 is a deficient number, since it is larger than the sum of its proper divisors (275650583).

1378252885 is an equidigital number, since it uses as much as digits as its factorization.

1378252885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275650582.

The product of its digits is 1075200, while the sum is 49.

The square root of 1378252885 is about 37124.8284171119. The cubic root of 1378252885 is about 1112.8662457830.

The spelling of 1378252885 in words is "one billion, three hundred seventy-eight million, two hundred fifty-two thousand, eight hundred eighty-five".