145744393 has 4 divisors (see below), whose sum is σ = 145790100. Its totient is φ = 145698688.

The previous prime is 145744387. The next prime is 145744397. The reversal of 145744393 is 393447541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393447541 = 17 ⋅23143973.

It can be written as a sum of positive squares in 2 ways, for example, as 26759929 + 118984464 = 5173^2 + 10908^2 .

It is a cyclic number.

It is not a de Polignac number, because 145744393 - 2⁹ = 145743881 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145744397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17680 + ... + 24577.

It is an arithmetic number, because the mean of its divisors is an integer number (36447525).

Almost surely, 2^145744393 is an apocalyptic number.

It is an amenable number.

145744393 is a deficient number, since it is larger than the sum of its proper divisors (45707).

145744393 is an equidigital number, since it uses as much as digits as its factorization.

145744393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45706.

The product of its digits is 181440, while the sum is 40.

The square root of 145744393 is about 12072.4642472032. The cubic root of 145744393 is about 526.2562724957.

The spelling of 145744393 in words is "one hundred forty-five million, seven hundred forty-four thousand, three hundred ninety-three".