1387651275 has 36 divisors (see below), whose sum is σ = 2487444960. Its totient is φ = 739483200.

The previous prime is 1387651261. The next prime is 1387651289. The reversal of 1387651275 is 5721567831.

It is a happy number.

1387651275 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1387651261) and next prime (1387651289).

It is not a de Polignac number, because 1387651275 - 2⁴ = 1387651259 is a prime.

It is a super-2 number, since 2×1387651275² = 3851152122018251250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1387651275.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 518190 + ... + 520860.

Almost surely, 2^1387651275 is an apocalyptic number.

1387651275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1387651275 is a deficient number, since it is larger than the sum of its proper divisors (1099793685).

1387651275 is a wasteful number, since it uses less digits than its factorization.

1387651275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4996 (or 4988 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 1387651275 is about 37251.1915916793. The cubic root of 1387651275 is about 1115.3900851800.

The spelling of 1387651275 in words is "one billion, three hundred eighty-seven million, six hundred fifty-one thousand, two hundred seventy-five".