1386720305 has 16 divisors (see below), whose sum is σ = 1672272000. Its totient is φ = 1103921280.

The previous prime is 1386720253. The next prime is 1386720319. The reversal of 1386720305 is 5030276831.

It is not a de Polignac number, because 1386720305 - 2¹⁴ = 1386703921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1321421 + ... + 1322469.

It is an arithmetic number, because the mean of its divisors is an integer number (104517000).

Almost surely, 2^1386720305 is an apocalyptic number.

It is an amenable number.

1386720305 is a deficient number, since it is larger than the sum of its proper divisors (285551695).

1386720305 is a wasteful number, since it uses less digits than its factorization.

1386720305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1386720305 is about 37238.6936532419. The cubic root of 1386720305 is about 1115.1405923785.

The spelling of 1386720305 in words is "one billion, three hundred eighty-six million, seven hundred twenty thousand, three hundred five".