13921004 has 6 divisors (see below), whose sum is σ = 24361764. Its totient is φ = 6960500.

The previous prime is 13921001. The next prime is 13921007. The reversal of 13921004 is 40012931.

It is an interprime number because it is at equal distance from previous prime (13921001) and next prime (13921007).

It is not an unprimeable number, because it can be changed into a prime (13921001) by changing a digit.

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, 1740122 + ... + 1740129.

It is an arithmetic number, because the mean of its divisors is an integer number (4060294).

Almost surely, 2^13921004 is an apocalyptic number.

It is an amenable number.

13921004 is a deficient number, since it is larger than the sum of its proper divisors (10440760).

13921004 is a wasteful number, since it uses less digits than its factorization.

13921004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480255 (or 3480253 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13921004 is about 3731.0861689326. The cubic root of 13921004 is about 240.5600577878.

Adding to 13921004 its reverse (40012931), we get a palindrome (53933935).

The spelling of 13921004 in words is "thirteen million, nine hundred twenty-one thousand, four".