1387937885 has 8 divisors (see below), whose sum is σ = 1763497656. Its totient is φ = 1045035520.

The previous prime is 1387937879. The next prime is 1387937911. The reversal of 1387937885 is 5887397831.

It can be written as a sum of positive squares in 4 ways, for example, as 420168004 + 967769881 = 20498^2 + 31109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1387937885 - 2¹⁰ = 1387936861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8164256 + ... + 8164425.

It is an arithmetic number, because the mean of its divisors is an integer number (220437207).

Almost surely, 2^1387937885 is an apocalyptic number.

It is an amenable number.

1387937885 is a deficient number, since it is larger than the sum of its proper divisors (375559771).

1387937885 is a wasteful number, since it uses less digits than its factorization.

1387937885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16328703.

The product of its digits is 10160640, while the sum is 59.

The square root of 1387937885 is about 37255.0383840897. The cubic root of 1387937885 is about 1115.4668719903.

The spelling of 1387937885 in words is "one billion, three hundred eighty-seven million, nine hundred thirty-seven thousand, eight hundred eighty-five".