1387527525 has 18 divisors (see below), whose sum is σ = 2485216370. Its totient is φ = 740014560.

The previous prime is 1387527521. The next prime is 1387527527. The reversal of 1387527525 is 5257257831.

1387527525 is a `hidden beast` number, since 1 + 38 + 75 + 27 + 525 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 222397569 + 1165129956 = 14913^2 + 34134^2 .

It is not a de Polignac number, because 1387527525 - 2² = 1387527521 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387527521) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 3083170 + ... + 3083619.

Almost surely, 2^1387527525 is an apocalyptic number.

1387527525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387527525 is a deficient number, since it is larger than the sum of its proper divisors (1097688845).

1387527525 is a wasteful number, since it uses less digits than its factorization.

1387527525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6166805 (or 6166797 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 1387527525 is about 37249.5305339544. The cubic root of 1387527525 is about 1115.3569275636.

The spelling of 1387527525 in words is "one billion, three hundred eighty-seven million, five hundred twenty-seven thousand, five hundred twenty-five".