1389144655 has 4 divisors (see below), whose sum is σ = 1666973592. Its totient is φ = 1111315720.

The previous prime is 1389144649. The next prime is 1389144661. The reversal of 1389144655 is 5564419831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1389144649) and next prime (1389144661).

It is not a de Polignac number, because 1389144655 - 2¹⁷ = 1389013583 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 3 ways as a sum of consecutive naturals, for example, 138914461 + ... + 138914470.

It is an arithmetic number, because the mean of its divisors is an integer number (416743398).

Almost surely, 2^1389144655 is an apocalyptic number.

1389144655 is a deficient number, since it is larger than the sum of its proper divisors (277828937).

1389144655 is an equidigital number, since it uses as much as digits as its factorization.

1389144655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277828936.

The product of its digits is 518400, while the sum is 46.

The square root of 1389144655 is about 37271.2309294984. The cubic root of 1389144655 is about 1115.7900665716.

The spelling of 1389144655 in words is "one billion, three hundred eighty-nine million, one hundred forty-four thousand, six hundred fifty-five".