1387946817 has 24 divisors (see below), whose sum is σ = 2020368480. Its totient is φ = 918146880.

The previous prime is 1387946797. The next prime is 1387946821. The reversal of 1387946817 is 7186497831.

It is not a de Polignac number, because 1387946817 - 2⁷ = 1387946689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387946887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 775798 + ... + 777584.

It is an arithmetic number, because the mean of its divisors is an integer number (84182020).

Almost surely, 2^1387946817 is an apocalyptic number.

It is an amenable number.

1387946817 is a deficient number, since it is larger than the sum of its proper divisors (632421663).

1387946817 is a wasteful number, since it uses less digits than its factorization.

1387946817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413 (or 2410 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 1387946817 is about 37255.1582603000. The cubic root of 1387946817 is about 1115.4692648276.

The spelling of 1387946817 in words is "one billion, three hundred eighty-seven million, nine hundred forty-six thousand, eight hundred seventeen".