145238393 has 2 divisors, whose sum is σ = 145238394. Its totient is φ = 145238392.

The previous prime is 145238371. The next prime is 145238411. The reversal of 145238393 is 393832541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88868329 + 56370064 = 9427^2 + 7508^2 .

It is an emirp because it is prime and its reverse (393832541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145238393 - 2⁶ = 145238329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145238363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72619196 + 72619197.

It is an arithmetic number, because the mean of its divisors is an integer number (72619197).

Almost surely, 2^145238393 is an apocalyptic number.

It is an amenable number.

145238393 is a deficient number, since it is larger than the sum of its proper divisors (1).

145238393 is an equidigital number, since it uses as much as digits as its factorization.

145238393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 145238393 is about 12051.4892440727. The cubic root of 145238393 is about 525.6465419245.

The spelling of 145238393 in words is "one hundred forty-five million, two hundred thirty-eight thousand, three hundred ninety-three".