1398655755 has 168 divisors, whose sum is σ = 3014371584. Its totient is φ = 620524800.

The previous prime is 1398655747. The next prime is 1398655781. The reversal of 1398655755 is 5575568931.

1398655755 is a `hidden beast` number, since 1 + 3 + 9 + 8 + 65 + 575 + 5 = 666.

It is not a de Polignac number, because 1398655755 - 2³ = 1398655747 is a prime.

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 167 ways as a sum of consecutive naturals, for example, 7322710 + ... + 7322900.

It is an arithmetic number, because the mean of its divisors is an integer number (17942688).

Almost surely, 2^1398655755 is an apocalyptic number.

1398655755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1398655755 is an abundant number, since it is smaller than the sum of its proper divisors (1615715829).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398655755 is an equidigital number, since it uses as much as digits as its factorization.

1398655755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 247 counting only the distinct ones).

The product of its digits is 5670000, while the sum is 54.

The square root of 1398655755 is about 37398.6063243004. The cubic root of 1398655755 is about 1118.3307817064.

The spelling of 1398655755 in words is "one billion, three hundred ninety-eight million, six hundred fifty-five thousand, seven hundred fifty-five".