38778139 has 16 divisors (see below), whose sum is σ = 42239232. Its totient is φ = 35463168.

The previous prime is 38778137. The next prime is 38778151. The reversal of 38778139 is 93187783.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 38778139 - 2¹ = 38778137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38778137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173782 + ... + 174004.

It is an arithmetic number, because the mean of its divisors is an integer number (2639952).

Almost surely, 2^38778139 is an apocalyptic number.

38778139 is a deficient number, since it is larger than the sum of its proper divisors (3461093).

38778139 is a wasteful number, since it uses less digits than its factorization.

38778139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486.

The product of its digits is 254016, while the sum is 46.

The square root of 38778139 is about 6227.2095676956. The cubic root of 38778139 is about 338.4768632908.

The spelling of 38778139 in words is "thirty-eight million, seven hundred seventy-eight thousand, one hundred thirty-nine".