1389939815 has 8 divisors (see below), whose sum is σ = 1819557648. Its totient is φ = 1010865280.

The previous prime is 1389939809. The next prime is 1389939823. The reversal of 1389939815 is 5189399831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1389939815 - 2⁴ = 1389939799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12635762 + ... + 12635871.

It is an arithmetic number, because the mean of its divisors is an integer number (227444706).

Almost surely, 2^1389939815 is an apocalyptic number.

1389939815 is a deficient number, since it is larger than the sum of its proper divisors (429617833).

1389939815 is a wasteful number, since it uses less digits than its factorization.

1389939815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25271649.

The product of its digits is 2099520, while the sum is 56.

The square root of 1389939815 is about 37281.8966121629. The cubic root of 1389939815 is about 1116.0029223490.

The spelling of 1389939815 in words is "one billion, three hundred eighty-nine million, nine hundred thirty-nine thousand, eight hundred fifteen".