38781047 has 4 divisors (see below), whose sum is σ = 38809296. Its totient is φ = 38752800.

The previous prime is 38781037. The next prime is 38781049. The reversal of 38781047 is 74018783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74018783 = 1579 ⋅46877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38781047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38781047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38781049) 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, 11954 + ... + 14847.

It is an arithmetic number, because the mean of its divisors is an integer number (9702324).

Almost surely, 2^38781047 is an apocalyptic number.

38781047 is a deficient number, since it is larger than the sum of its proper divisors (28249).

38781047 is a wasteful number, since it uses less digits than its factorization.

38781047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28248.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 38781047 is about 6227.4430547376. The cubic root of 38781047 is about 338.4853239522.

The spelling of 38781047 in words is "thirty-eight million, seven hundred eighty-one thousand, forty-seven".