38278013 has 4 divisors (see below), whose sum is σ = 38521980. Its totient is φ = 38034048.

The previous prime is 38278007. The next prime is 38278021. The reversal of 38278013 is 31087283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31087283 = 23 ⋅1351621.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 19598329 = 4322^2 + 4427^2 .

It is a cyclic number.

It is not a de Polignac number, because 38278013 - 2⁴ = 38277997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38278913) 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, 121748 + ... + 122061.

It is an arithmetic number, because the mean of its divisors is an integer number (9630495).

Almost surely, 2^38278013 is an apocalyptic number.

It is an amenable number.

38278013 is a deficient number, since it is larger than the sum of its proper divisors (243967).

38278013 is a wasteful number, since it uses less digits than its factorization.

38278013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243966.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 38278013 is about 6186.9227407492. The cubic root of 38278013 is about 337.0154377781.

The spelling of 38278013 in words is "thirty-eight million, two hundred seventy-eight thousand, thirteen".