1388889015 has 16 divisors (see below), whose sum is σ = 2223310848. Its totient is φ = 740378016.

The previous prime is 1388889013. The next prime is 1388889031. The reversal of 1388889015 is 5109888831.

It is not a de Polignac number, because 1388889015 - 2¹ = 1388889013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388889011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10542 + ... + 53748.

It is an arithmetic number, because the mean of its divisors is an integer number (138956928).

Almost surely, 2^1388889015 is an apocalyptic number.

1388889015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1388889015 is a deficient number, since it is larger than the sum of its proper divisors (834421833).

1388889015 is a wasteful number, since it uses less digits than its factorization.

1388889015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45358.

The product of its (nonzero) digits is 552960, while the sum is 51.

The square root of 1388889015 is about 37267.8013169546. The cubic root of 1388889015 is about 1115.7216172395.

The spelling of 1388889015 in words is "one billion, three hundred eighty-eight million, eight hundred eighty-nine thousand, fifteen".