38784139 has 2 divisors, whose sum is σ = 38784140. Its totient is φ = 38784138.

The previous prime is 38784133. The next prime is 38784169. The reversal of 38784139 is 93148783.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38784139 - 2¹⁷ = 38653067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38784095 and 38784104.

It is not a weakly prime, because it can be changed into another prime (38784133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19392069 + 19392070.

It is an arithmetic number, because the mean of its divisors is an integer number (19392070).

Almost surely, 2^38784139 is an apocalyptic number.

38784139 is a deficient number, since it is larger than the sum of its proper divisors (1).

38784139 is an equidigital number, since it uses as much as digits as its factorization.

38784139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 38784139 is about 6227.6913057730. The cubic root of 38784139 is about 338.4943194873.

The spelling of 38784139 in words is "thirty-eight million, seven hundred eighty-four thousand, one hundred thirty-nine".