1138840155 has 56 divisors (see below), whose sum is σ = 2056746192. Its totient is φ = 605081664.

The previous prime is 1138840151. The next prime is 1138840177. The reversal of 1138840155 is 5510488311.

It is not a de Polignac number, because 1138840155 - 2² = 1138840151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138840151) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1446672 + ... + 1447458.

Almost surely, 2^1138840155 is an apocalyptic number.

1138840155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1138840155 is a deficient number, since it is larger than the sum of its proper divisors (917906037).

1138840155 is an frugal number, since it uses more digits than its factorization.

1138840155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 1138840155 is about 33746.7058392371. The cubic root of 1138840155 is about 1044.2895302804.

The spelling of 1138840155 in words is "one billion, one hundred thirty-eight million, eight hundred forty thousand, one hundred fifty-five".