13139998 has 4 divisors (see below), whose sum is σ = 19710000. Its totient is φ = 6569998.

The previous prime is 13139993. The next prime is 13140007. The reversal of 13139998 is 89993131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89993131 = 151 ⋅595981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13139993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3284998 + ... + 3285001.

It is an arithmetic number, because the mean of its divisors is an integer number (4927500).

Almost surely, 2^13139998 is an apocalyptic number.

13139998 is a deficient number, since it is larger than the sum of its proper divisors (6570002).

13139998 is an equidigital number, since it uses as much as digits as its factorization.

13139998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570001.

The product of its digits is 52488, while the sum is 43.

The square root of 13139998 is about 3624.9135162097. The cubic root of 13139998 is about 235.9745136702.

It can be divided in two parts, 1313 and 9998, that added together give a palindrome (11311).

The spelling of 13139998 in words is "thirteen million, one hundred thirty-nine thousand, nine hundred ninety-eight".