13981598 has 4 divisors (see below), whose sum is σ = 20972400. Its totient is φ = 6990798.

The previous prime is 13981577. The next prime is 13981601. The reversal of 13981598 is 89518931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89518931 = 419 ⋅213649.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495398 + ... + 3495401.

It is an arithmetic number, because the mean of its divisors is an integer number (5243100).

Almost surely, 2^13981598 is an apocalyptic number.

13981598 is a deficient number, since it is larger than the sum of its proper divisors (6990802).

13981598 is an equidigital number, since it uses as much as digits as its factorization.

13981598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990801.

The product of its digits is 77760, while the sum is 44.

The square root of 13981598 is about 3739.1975074874. The cubic root of 13981598 is about 240.9085814546.

It can be divided in two parts, 13981 and 598, that multiplied together give a palindrome (8360638).

The spelling of 13981598 in words is "thirteen million, nine hundred eighty-one thousand, five hundred ninety-eight".