1389395655 has 24 divisors (see below), whose sum is σ = 2491332480. Its totient is φ = 715458240.

The previous prime is 1389395629. The next prime is 1389395677. The reversal of 1389395655 is 5565939831.

It is a happy number.

It is not a de Polignac number, because 1389395655 - 2¹⁸ = 1389133511 is a prime.

It is a super-2 number, since 2×1389395655² = 3860840572265758050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 531031 + ... + 533640.

It is an arithmetic number, because the mean of its divisors is an integer number (103805520).

Almost surely, 2^1389395655 is an apocalyptic number.

1389395655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1389395655 is a deficient number, since it is larger than the sum of its proper divisors (1101936825).

1389395655 is a wasteful number, since it uses less digits than its factorization.

1389395655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064711 (or 1064708 counting only the distinct ones).

The product of its digits is 4374000, while the sum is 54.

The square root of 1389395655 is about 37274.5979857597. The cubic root of 1389395655 is about 1115.8572653426.

The spelling of 1389395655 in words is "one billion, three hundred eighty-nine million, three hundred ninety-five thousand, six hundred fifty-five".