1388432865 has 16 divisors (see below), whose sum is σ = 2222179200. Its totient is φ = 740268672.

The previous prime is 1388432863. The next prime is 1388432887. The reversal of 1388432865 is 5682348831.

It is not a de Polignac number, because 1388432865 - 2¹ = 1388432863 is a prime.

It is a super-2 number, since 2×1388432865² = 3855491641224216450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1388432863) 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, 43341 + ... + 68229.

It is an arithmetic number, because the mean of its divisors is an integer number (138886200).

Almost surely, 2^1388432865 is an apocalyptic number.

1388432865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388432865 is a deficient number, since it is larger than the sum of its proper divisors (833746335).

1388432865 is a wasteful number, since it uses less digits than its factorization.

1388432865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28616.

The product of its digits is 1105920, while the sum is 48.

The square root of 1388432865 is about 37261.6809202161. The cubic root of 1388432865 is about 1115.5994591364.

The spelling of 1388432865 in words is "one billion, three hundred eighty-eight million, four hundred thirty-two thousand, eight hundred sixty-five".