1387697845 has 16 divisors (see below), whose sum is σ = 1792104048. Its totient is φ = 1027722240.

The previous prime is 1387697827. The next prime is 1387697863. The reversal of 1387697845 is 5487967831.

It is an interprime number because it is at equal distance from previous prime (1387697827) and next prime (1387697863).

It can be written as a sum of positive squares in 8 ways, for example, as 91049764 + 1296648081 = 9542^2 + 36009^2 .

It is not a de Polignac number, because 1387697845 - 2¹⁷ = 1387566773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387697845.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128634 + ... + 139003.

It is an arithmetic number, because the mean of its divisors is an integer number (112006503).

Almost surely, 2^1387697845 is an apocalyptic number.

It is an amenable number.

1387697845 is a deficient number, since it is larger than the sum of its proper divisors (404406203).

1387697845 is a wasteful number, since it uses less digits than its factorization.

1387697845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267720.

The product of its digits is 10160640, while the sum is 58.

The square root of 1387697845 is about 37251.8166671103. The cubic root of 1387697845 is about 1115.4025626509.

The spelling of 1387697845 in words is "one billion, three hundred eighty-seven million, six hundred ninety-seven thousand, eight hundred forty-five".