1138665723 has 12 divisors (see below), whose sum is σ = 1643991480. Its totient is φ = 700717056.

The previous prime is 1138665707. The next prime is 1138665739. The reversal of 1138665723 is 3275668311.

It is an interprime number because it is at equal distance from previous prime (1138665707) and next prime (1138665739).

It is not a de Polignac number, because 1138665723 - 2⁴ = 1138665707 is a prime.

It is a super-2 number, since 2×1138665723² = 2593119257470225458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1138665793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1122438 + ... + 1123451.

It is an arithmetic number, because the mean of its divisors is an integer number (136999290).

Almost surely, 2^1138665723 is an apocalyptic number.

1138665723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1138665723 is a deficient number, since it is larger than the sum of its proper divisors (505325757).

1138665723 is a wasteful number, since it uses less digits than its factorization.

1138665723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245918 (or 2245905 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 1138665723 is about 33744.1213102371. The cubic root of 1138665723 is about 1044.2362108830.

The spelling of 1138665723 in words is "one billion, one hundred thirty-eight million, six hundred sixty-five thousand, seven hundred twenty-three".