1388915275 has 12 divisors (see below), whose sum is σ = 1878823944. Its totient is φ = 1010120000.

The previous prime is 1388915273. The next prime is 1388915291. The reversal of 1388915275 is 5725198831.

It is not a de Polignac number, because 1388915275 - 2¹ = 1388915273 is a prime.

It is a super-2 number, since 2×1388915275² = 3858171282256651250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388915273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2525026 + ... + 2525575.

It is an arithmetic number, because the mean of its divisors is an integer number (156568662).

Almost surely, 2^1388915275 is an apocalyptic number.

1388915275 is a deficient number, since it is larger than the sum of its proper divisors (489908669).

1388915275 is a wasteful number, since it uses less digits than its factorization.

1388915275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050622 (or 5050617 counting only the distinct ones).

The product of its digits is 604800, while the sum is 49.

The square root of 1388915275 is about 37268.1536301438. The cubic root of 1388915275 is about 1115.7286489184.

The spelling of 1388915275 in words is "one billion, three hundred eighty-eight million, nine hundred fifteen thousand, two hundred seventy-five".