1387500129 has 6 divisors (see below), whose sum is σ = 2004166866. Its totient is φ = 925000080.

The previous prime is 1387500089. The next prime is 1387500167. The reversal of 1387500129 is 9210057831.

1387500129 is a `hidden beast` number, since 138 + 7 + 500 + 12 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 785288529 + 602211600 = 28023^2 + 24540^2 .

It is not a de Polignac number, because 1387500129 - 2²⁰ = 1386451553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1387500093 and 1387500102.

It is not an unprimeable number, because it can be changed into a prime (1387500199) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77083332 + ... + 77083349.

It is an arithmetic number, because the mean of its divisors is an integer number (334027811).

Almost surely, 2^1387500129 is an apocalyptic number.

It is an amenable number.

1387500129 is a deficient number, since it is larger than the sum of its proper divisors (616666737).

1387500129 is a wasteful number, since it uses less digits than its factorization.

1387500129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154166687 (or 154166684 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1387500129 is about 37249.1627959609. The cubic root of 1387500129 is about 1115.3495868036.

The spelling of 1387500129 in words is "one billion, three hundred eighty-seven million, five hundred thousand, one hundred twenty-nine".