15238138 has 4 divisors (see below), whose sum is σ = 22857210. Its totient is φ = 7619068.

The previous prime is 15238127. The next prime is 15238141. The reversal of 15238138 is 83183251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15186609 + 51529 = 3897^2 + 227^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3809533 + ... + 3809536.

Almost surely, 2^15238138 is an apocalyptic number.

15238138 is a deficient number, since it is larger than the sum of its proper divisors (7619072).

15238138 is an equidigital number, since it uses as much as digits as its factorization.

15238138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7619071.

The product of its digits is 5760, while the sum is 31.

The square root of 15238138 is about 3903.6057690294. The cubic root of 15238138 is about 247.9194696040.

It can be divided in two parts, 15238 and 138, that added together give a square (15376 = 124²).

The spelling of 15238138 in words is "fifteen million, two hundred thirty-eight thousand, one hundred thirty-eight".