38447939 has 4 divisors (see below), whose sum is σ = 39773760. Its totient is φ = 37122120.

The previous prime is 38447933. The next prime is 38448023. The reversal of 38447939 is 93974483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93974483 = 191 ⋅492013.

It is a cyclic number.

It is not a de Polignac number, because 38447939 - 2⁸ = 38447683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38447893 and 38447902.

It is not an unprimeable number, because it can be changed into a prime (38447933) 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, 662867 + ... + 662924.

It is an arithmetic number, because the mean of its divisors is an integer number (9943440).

Almost surely, 2^38447939 is an apocalyptic number.

38447939 is a deficient number, since it is larger than the sum of its proper divisors (1325821).

38447939 is a wasteful number, since it uses less digits than its factorization.

38447939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325820.

The product of its digits is 653184, while the sum is 47.

The square root of 38447939 is about 6200.6402088817. The cubic root of 38447939 is about 337.5134012054.

The spelling of 38447939 in words is "thirty-eight million, four hundred forty-seven thousand, nine hundred thirty-nine".