4138529391 has 24 divisors (see below), whose sum is σ = 6049740320. Its totient is φ = 2725975296.

The previous prime is 4138529387. The next prime is 4138529393. The reversal of 4138529391 is 1939258314.

It is a happy number.

4138529391 is a `hidden beast` number, since 4 + 1 + 38 + 529 + 3 + 91 = 666.

It is not a de Polignac number, because 4138529391 - 2² = 4138529387 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 (4138529393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418755 + ... + 428523.

Almost surely, 2^4138529391 is an apocalyptic number.

4138529391 is a deficient number, since it is larger than the sum of its proper divisors (1911210929).

4138529391 is a wasteful number, since it uses less digits than its factorization.

4138529391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335 (or 10332 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 4138529391 is about 64331.4028371836. The cubic root of 4138529391 is about 1605.5186247238.

The spelling of 4138529391 in words is "four billion, one hundred thirty-eight million, five hundred twenty-nine thousand, three hundred ninety-one".