30726145 has 4 divisors (see below), whose sum is σ = 36871380. Its totient is φ = 24580912.

The previous prime is 30726131. The next prime is 30726161. The reversal of 30726145 is 54162703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54162703 = 7 ⋅7737529.

It can be written as a sum of positive squares in 2 ways, for example, as 10870209 + 19855936 = 3297^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 30726145 - 2⁹ = 30725633 is a prime.

It is a super-2 number, since 2×30726145² = 1888191973122050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3072610 + ... + 3072619.

It is an arithmetic number, because the mean of its divisors is an integer number (9217845).

Almost surely, 2^30726145 is an apocalyptic number.

It is an amenable number.

30726145 is a deficient number, since it is larger than the sum of its proper divisors (6145235).

30726145 is an equidigital number, since it uses as much as digits as its factorization.

30726145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145234.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 30726145 is about 5543.1169029707. The cubic root of 30726145 is about 313.2102925937.

Adding to 30726145 its reverse (54162703), we get a palindrome (84888848).

It can be divided in two parts, 3072 and 6145, that multiplied together give a triangular number (18877440 = T₆₁₄₄).

The spelling of 30726145 in words is "thirty million, seven hundred twenty-six thousand, one hundred forty-five".