30705145 has 8 divisors (see below), whose sum is σ = 39013704. Its totient is φ = 23119104.

The previous prime is 30705137. The next prime is 30705149. The reversal of 30705145 is 54150703.

It can be written as a sum of positive squares in 4 ways, for example, as 17397241 + 13307904 = 4171^2 + 3648^2 .

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 30705145 - 2³ = 30705137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30705149) 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, 180534 + ... + 180703.

It is an arithmetic number, because the mean of its divisors is an integer number (4876713).

Almost surely, 2^30705145 is an apocalyptic number.

It is an amenable number.

30705145 is a deficient number, since it is larger than the sum of its proper divisors (8308559).

30705145 is a wasteful number, since it uses less digits than its factorization.

30705145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361259.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 30705145 is about 5541.2223380767. Note that the first 3 decimals coincide. The cubic root of 30705145 is about 313.1389210720.

Adding to 30705145 its reverse (54150703), we get a palindrome (84855848).

The spelling of 30705145 in words is "thirty million, seven hundred five thousand, one hundred forty-five".