1139723 has 4 divisors (see below), whose sum is σ = 1227408. Its totient is φ = 1052040.

The previous prime is 1139717. The next prime is 1139741. The reversal of 1139723 is 3279311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3279311 = 7 ⋅468473.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1139723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1139692 and 1139701.

It is not an unprimeable number, because it can be changed into a prime (1139713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43823 + ... + 43848.

It is an arithmetic number, because the mean of its divisors is an integer number (306852).

2^1139723 is an apocalyptic number.

1139723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1139723 is a deficient number, since it is larger than the sum of its proper divisors (87685).

1139723 is an equidigital number, since it uses as much as digits as its factorization.

1139723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87684.

The product of its digits is 1134, while the sum is 26.

The square root of 1139723 is about 1067.5781001875. The cubic root of 1139723 is about 104.4559309919.

The spelling of 1139723 in words is "one million, one hundred thirty-nine thousand, seven hundred twenty-three".