145257305 has 8 divisors (see below), whose sum is σ = 181887552. Its totient is φ = 111153328.

The previous prime is 145257293. The next prime is 145257313. The reversal of 145257305 is 503752541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145257305 - 2⁶ = 145257241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 631439 + ... + 631668.

It is an arithmetic number, because the mean of its divisors is an integer number (22735944).

Almost surely, 2^145257305 is an apocalyptic number.

It is an amenable number.

145257305 is a deficient number, since it is larger than the sum of its proper divisors (36630247).

145257305 is a wasteful number, since it uses less digits than its factorization.

145257305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263135.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 145257305 is about 12052.2738518505. The cubic root of 145257305 is about 525.6693563602.

The spelling of 145257305 in words is "one hundred forty-five million, two hundred fifty-seven thousand, three hundred five".