1389724886 has 16 divisors (see below), whose sum is σ = 2276425728. Its totient is φ = 631045800.

The previous prime is 1389724873. The next prime is 1389724913. The reversal of 1389724886 is 6884279831.

It is a Curzon 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, 10070 + ... + 53673.

It is an arithmetic number, because the mean of its divisors is an integer number (142276608).

Almost surely, 2^1389724886 is an apocalyptic number.

1389724886 is a deficient number, since it is larger than the sum of its proper divisors (886700842).

1389724886 is a wasteful number, since it uses less digits than its factorization.

1389724886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64747.

The product of its digits is 4644864, while the sum is 56.

The square root of 1389724886 is about 37279.0140159313. The cubic root of 1389724886 is about 1115.9453961756.

Subtracting 1389724886 from its reverse (6884279831), we obtain a palindrome (5494554945).

It can be divided in two parts, 13897 and 24886, that added together give a palindrome (38783).

The spelling of 1389724886 in words is "one billion, three hundred eighty-nine million, seven hundred twenty-four thousand, eight hundred eighty-six".