145478309 has 8 divisors (see below), whose sum is σ = 146408472. Its totient is φ = 144551680.

The previous prime is 145478293. The next prime is 145478323. The reversal of 145478309 is 903874541.

145478309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35438209 + 110040100 = 5953^2 + 10490^2 .

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 145478309 - 2⁴ = 145478293 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145478329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152177 + ... + 153129.

It is an arithmetic number, because the mean of its divisors is an integer number (18301059).

Almost surely, 2^145478309 is an apocalyptic number.

It is an amenable number.

145478309 is a deficient number, since it is larger than the sum of its proper divisors (930163).

145478309 is an equidigital number, since it uses as much as digits as its factorization.

145478309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 145478309 is about 12061.4389274249. The cubic root of 145478309 is about 525.9358172252.

The spelling of 145478309 in words is "one hundred forty-five million, four hundred seventy-eight thousand, three hundred nine".