38139471 has 32 divisors (see below), whose sum is σ = 58544640. Its totient is φ = 24523200.

The previous prime is 38139463. The next prime is 38139473. The reversal of 38139471 is 17493183.

It is a happy number.

It is not a de Polignac number, because 38139471 - 2³ = 38139463 is a prime.

It is a super-3 number, since 3×38139471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38139473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144886 + ... + 145148.

It is an arithmetic number, because the mean of its divisors is an integer number (1829520).

Almost surely, 2^38139471 is an apocalyptic number.

38139471 is a deficient number, since it is larger than the sum of its proper divisors (20405169).

38139471 is a wasteful number, since it uses less digits than its factorization.

38139471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 438 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 38139471 is about 6175.7162337659. The cubic root of 38139471 is about 336.6083525877.

The spelling of 38139471 in words is "thirty-eight million, one hundred thirty-nine thousand, four hundred seventy-one".