1386506939 has 4 divisors (see below), whose sum is σ = 1388845656. Its totient is φ = 1384168224.

The previous prime is 1386506887. The next prime is 1386506951. The reversal of 1386506939 is 9396056831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9396056831 = 7 ⋅1342293833.

It is a cyclic number.

It is not a de Polignac number, because 1386506939 - 2⁸ = 1386506683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386506039) 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, 1168469 + ... + 1169654.

It is an arithmetic number, because the mean of its divisors is an integer number (347211414).

Almost surely, 2^1386506939 is an apocalyptic number.

1386506939 is a deficient number, since it is larger than the sum of its proper divisors (2338717).

1386506939 is an equidigital number, since it uses as much as digits as its factorization.

1386506939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338716.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 1386506939 is about 37235.8287003257. The cubic root of 1386506939 is about 1115.0833962035.

The spelling of 1386506939 in words is "one billion, three hundred eighty-six million, five hundred six thousand, nine hundred thirty-nine".