38139786 has 12 divisors (see below), whose sum is σ = 82636242. Its totient is φ = 12713256.

The previous prime is 38139781. The next prime is 38139809. The reversal of 38139786 is 68793183.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20875761 + 17264025 = 4569^2 + 4155^2 .

It is a super-3 number, since 3×38139786³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (38139781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1059421 + ... + 1059456.

Almost surely, 2^38139786 is an apocalyptic number.

38139786 is an abundant number, since it is smaller than the sum of its proper divisors (44496456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38139786 is a wasteful number, since it uses less digits than its factorization.

38139786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118885 (or 2118882 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 38139786 is about 6175.7417368281. The cubic root of 38139786 is about 336.6092792860.

The spelling of 38139786 in words is "thirty-eight million, one hundred thirty-nine thousand, seven hundred eighty-six".