1386939481 has 4 divisors (see below), whose sum is σ = 1388074752. Its totient is φ = 1385804212.

The previous prime is 1386939479. The next prime is 1386939511. The reversal of 1386939481 is 1849396831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1386939481 - 2¹ = 1386939479 is a prime.

It is a super-2 number, since 2×1386939481² = 3847202247913098722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386939401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565801 + ... + 568246.

It is an arithmetic number, because the mean of its divisors is an integer number (347018688).

Almost surely, 2^1386939481 is an apocalyptic number.

It is an amenable number.

1386939481 is a deficient number, since it is larger than the sum of its proper divisors (1135271).

1386939481 is a wasteful number, since it uses less digits than its factorization.

1386939481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135270.

The product of its digits is 1119744, while the sum is 52.

The square root of 1386939481 is about 37241.6363899332. The cubic root of 1386939481 is about 1115.1993399087.

The spelling of 1386939481 in words is "one billion, three hundred eighty-six million, nine hundred thirty-nine thousand, four hundred eighty-one".