1138393555 has 32 divisors (see below), whose sum is σ = 1508290560. Its totient is φ = 819711360.

The previous prime is 1138393547. The next prime is 1138393573. The reversal of 1138393555 is 5553938311.

It is not a de Polignac number, because 1138393555 - 2³ = 1138393547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 424870 + ... + 427540.

It is an arithmetic number, because the mean of its divisors is an integer number (47134080).

Almost surely, 2^1138393555 is an apocalyptic number.

1138393555 is a deficient number, since it is larger than the sum of its proper divisors (369897005).

1138393555 is a wasteful number, since it uses less digits than its factorization.

1138393555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851.

The product of its digits is 243000, while the sum is 43.

The square root of 1138393555 is about 33740.0882482545. The cubic root of 1138393555 is about 1044.1530052145.

The spelling of 1138393555 in words is "one billion, one hundred thirty-eight million, three hundred ninety-three thousand, five hundred fifty-five".