1387939085 has 16 divisors (see below), whose sum is σ = 1800051120. Its totient is φ = 1021278720.

The previous prime is 1387939081. The next prime is 1387939121. The reversal of 1387939085 is 5809397831.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 260725609 + 1127213476 = 16147^2 + 33574^2 .

It is not a de Polignac number, because 1387939085 - 2² = 1387939081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387939081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19730 + ... + 56259.

It is an arithmetic number, because the mean of its divisors is an integer number (112503195).

Almost surely, 2^1387939085 is an apocalyptic number.

It is an amenable number.

1387939085 is a deficient number, since it is larger than the sum of its proper divisors (412112035).

1387939085 is a wasteful number, since it uses less digits than its factorization.

1387939085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76288.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 1387939085 is about 37255.0544892904. The cubic root of 1387939085 is about 1115.4671934648.

The spelling of 1387939085 in words is "one billion, three hundred eighty-seven million, nine hundred thirty-nine thousand, eighty-five".