15139394 has 4 divisors (see below), whose sum is σ = 22709094. Its totient is φ = 7569696.

The previous prime is 15139393. The next prime is 15139417. The reversal of 15139394 is 49393151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49393151 = 41 ⋅1204711.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 30625 = 3887^2 + 175^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15139391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3784847 + ... + 3784850.

Almost surely, 2^15139394 is an apocalyptic number.

15139394 is a deficient number, since it is larger than the sum of its proper divisors (7569700).

15139394 is an equidigital number, since it uses as much as digits as its factorization.

15139394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7569699.

The product of its digits is 14580, while the sum is 35.

The square root of 15139394 is about 3890.9374191832. The cubic root of 15139394 is about 247.3827979588.

The spelling of 15139394 in words is "fifteen million, one hundred thirty-nine thousand, three hundred ninety-four".