38191145 has 4 divisors (see below), whose sum is σ = 45829380. Its totient is φ = 30552912.

The previous prime is 38191117. The next prime is 38191147. The reversal of 38191145 is 54119183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54119183 = 67 ⋅807749.

It can be written as a sum of positive squares in 2 ways, for example, as 11182336 + 27008809 = 3344^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 38191145 - 2⁶ = 38191081 is a prime.

It is a super-2 number, since 2×38191145² = 2917127112822050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38191147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3819110 + ... + 3819119.

It is an arithmetic number, because the mean of its divisors is an integer number (11457345).

Almost surely, 2^38191145 is an apocalyptic number.

It is an amenable number.

38191145 is a deficient number, since it is larger than the sum of its proper divisors (7638235).

38191145 is an equidigital number, since it uses as much as digits as its factorization.

38191145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638234.

The product of its digits is 4320, while the sum is 32.

The square root of 38191145 is about 6179.8984619490. The cubic root of 38191145 is about 336.7603040960.

The spelling of 38191145 in words is "thirty-eight million, one hundred ninety-one thousand, one hundred forty-five".