145668923 has 4 divisors (see below), whose sum is σ = 146541360. Its totient is φ = 144796488.

The previous prime is 145668899. The next prime is 145668973. The reversal of 145668923 is 329866541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329866541 = 53 ⋅6223897.

It is a cyclic number.

It is not a de Polignac number, because 145668923 - 2¹⁶ = 145603387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145668973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435968 + ... + 436301.

It is an arithmetic number, because the mean of its divisors is an integer number (36635340).

Almost surely, 2^145668923 is an apocalyptic number.

145668923 is a deficient number, since it is larger than the sum of its proper divisors (872437).

145668923 is an equidigital number, since it uses as much as digits as its factorization.

145668923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872436.

The product of its digits is 311040, while the sum is 44.

The square root of 145668923 is about 12069.3381342972. The cubic root of 145668923 is about 526.1654207028.

The spelling of 145668923 in words is "one hundred forty-five million, six hundred sixty-eight thousand, nine hundred twenty-three".