1387386309 has 4 divisors (see below), whose sum is σ = 1849848416. Its totient is φ = 924924204.

The previous prime is 1387386281. The next prime is 1387386313. The reversal of 1387386309 is 9036837831.

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 not a de Polignac number, because 1387386309 - 2⁵ = 1387386277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387386359) 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, 231231049 + ... + 231231054.

It is an arithmetic number, because the mean of its divisors is an integer number (462462104).

Almost surely, 2^1387386309 is an apocalyptic number.

It is an amenable number.

1387386309 is a deficient number, since it is larger than the sum of its proper divisors (462462107).

1387386309 is an equidigital number, since it uses as much as digits as its factorization.

1387386309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462462106.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1387386309 is about 37247.6349450539. The cubic root of 1387386309 is about 1115.3190876926.

The spelling of 1387386309 in words is "one billion, three hundred eighty-seven million, three hundred eighty-six thousand, three hundred nine".