38139618 has 16 divisors (see below), whose sum is σ = 83213856. Its totient is φ = 11557440.

The previous prime is 38139617. The next prime is 38139643. The reversal of 38139618 is 81693183.

It is a super-2 number, since 2×38139618² = 2909260922371848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38139613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288871 + ... + 289002.

It is an arithmetic number, because the mean of its divisors is an integer number (5200866).

Almost surely, 2^38139618 is an apocalyptic number.

38139618 is an abundant number, since it is smaller than the sum of its proper divisors (45074238).

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

38139618 is a wasteful number, since it uses less digits than its factorization.

38139618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577889.

The product of its digits is 31104, while the sum is 39.

The square root of 38139618 is about 6175.7281352080. The cubic root of 38139618 is about 336.6087850475.

It can be divided in two parts, 3813 and 9618, that added together give a palindrome (13431).

The spelling of 38139618 in words is "thirty-eight million, one hundred thirty-nine thousand, six hundred eighteen".