1138555870 has 16 divisors (see below), whose sum is σ = 2056804128. Its totient is φ = 453777120.

The previous prime is 1138555853. The next prime is 1138555877. The reversal of 1138555870 is 785558311.

It is a happy number.

It is a super-2 number, since 2×1138555870² = 2592618938222913800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138555877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202746 + ... + 208285.

It is an arithmetic number, because the mean of its divisors is an integer number (128550258).

Almost surely, 2^1138555870 is an apocalyptic number.

1138555870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1138555870 is a deficient number, since it is larger than the sum of its proper divisors (918248258).

1138555870 is a wasteful number, since it uses less digits than its factorization.

1138555870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411315.

The product of its (nonzero) digits is 168000, while the sum is 43.

The square root of 1138555870 is about 33742.4935355999. The cubic root of 1138555870 is about 1044.2026288383.

The spelling of 1138555870 in words is "one billion, one hundred thirty-eight million, five hundred fifty-five thousand, eight hundred seventy".