1166400239 has 4 divisors (see below), whose sum is σ = 1166836056. Its totient is φ = 1165964424.

The previous prime is 1166400233. The next prime is 1166400251. The reversal of 1166400239 is 9320046611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9320046611 = 19 ⋅490528769.

It is a cyclic number.

It is not a de Polignac number, because 1166400239 - 2⁴ = 1166400223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166400233) 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, 213869 + ... + 219254.

It is an arithmetic number, because the mean of its divisors is an integer number (291709014).

Almost surely, 2^1166400239 is an apocalyptic number.

1166400239 is a deficient number, since it is larger than the sum of its proper divisors (435817).

1166400239 is an equidigital number, since it uses as much as digits as its factorization.

1166400239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435816.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1166400239 is about 34152.6022288200. The cubic root of 1166400239 is about 1052.6464576538.

The spelling of 1166400239 in words is "one billion, one hundred sixty-six million, four hundred thousand, two hundred thirty-nine".