1388642554 has 16 divisors (see below), whose sum is σ = 2320544520. Its totient is φ = 618811200.

The previous prime is 1388642483. The next prime is 1388642557. The reversal of 1388642554 is 4552468831.

It can be written as a sum of positive squares in 4 ways, for example, as 465394329 + 923248225 = 21573^2 + 30385^2 .

It is not an unprimeable number, because it can be changed into a prime (1388642557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920097 + ... + 921604.

Almost surely, 2^1388642554 is an apocalyptic number.

1388642554 is a deficient number, since it is larger than the sum of its proper divisors (931901966).

1388642554 is a wasteful number, since it uses less digits than its factorization.

1388642554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841745.

The product of its digits is 921600, while the sum is 46.

The square root of 1388642554 is about 37264.4945491013. The cubic root of 1388642554 is about 1115.6556176937.

The spelling of 1388642554 in words is "one billion, three hundred eighty-eight million, six hundred forty-two thousand, five hundred fifty-four".