145853639 has 4 divisors (see below), whose sum is σ = 145897440. Its totient is φ = 145809840.

The previous prime is 145853627. The next prime is 145853641. The reversal of 145853639 is 936358541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936358541 = 3527 ⋅265483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145853639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145853639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145853699) 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, 16454 + ... + 23715.

It is an arithmetic number, because the mean of its divisors is an integer number (36474360).

Almost surely, 2^145853639 is an apocalyptic number.

145853639 is a deficient number, since it is larger than the sum of its proper divisors (43801).

145853639 is an equidigital number, since it uses as much as digits as its factorization.

145853639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43800.

The product of its digits is 388800, while the sum is 44.

The square root of 145853639 is about 12076.9879937011. The cubic root of 145853639 is about 526.3877287457.

The spelling of 145853639 in words is "one hundred forty-five million, eight hundred fifty-three thousand, six hundred thirty-nine".