38915845 has 4 divisors (see below), whose sum is σ = 46699020. Its totient is φ = 31132672.

The previous prime is 38915837. The next prime is 38915861. The reversal of 38915845 is 54851983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54851983 = 2801 ⋅19583.

It can be written as a sum of positive squares in 2 ways, for example, as 7935489 + 30980356 = 2817^2 + 5566^2 .

It is a cyclic number.

It is not a de Polignac number, because 38915845 - 2³ = 38915837 is a prime.

It is a congruent number.

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, 3891580 + ... + 3891589.

It is an arithmetic number, because the mean of its divisors is an integer number (11674755).

Almost surely, 2^38915845 is an apocalyptic number.

It is an amenable number.

38915845 is a deficient number, since it is larger than the sum of its proper divisors (7783175).

38915845 is an equidigital number, since it uses as much as digits as its factorization.

38915845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783174.

The product of its digits is 172800, while the sum is 43.

The square root of 38915845 is about 6238.2565673432. The cubic root of 38915845 is about 338.8770477911.

The spelling of 38915845 in words is "thirty-eight million, nine hundred fifteen thousand, eight hundred forty-five".