1387501385 has 4 divisors (see below), whose sum is σ = 1665001668. Its totient is φ = 1110001104.

The previous prime is 1387501373. The next prime is 1387501387. The reversal of 1387501385 is 5831057831.

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 1043806864 + 343694521 = 32308^2 + 18539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387501385 - 2¹⁸ = 1387239241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1387501387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138750134 + ... + 138750143.

It is an arithmetic number, because the mean of its divisors is an integer number (416250417).

Almost surely, 2^1387501385 is an apocalyptic number.

It is an amenable number.

1387501385 is a deficient number, since it is larger than the sum of its proper divisors (277500283).

1387501385 is an equidigital number, since it uses as much as digits as its factorization.

1387501385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277500282.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 1387501385 is about 37249.1796553964. The cubic root of 1387501385 is about 1115.3499233510.

The spelling of 1387501385 in words is "one billion, three hundred eighty-seven million, five hundred one thousand, three hundred eighty-five".