13899021 has 8 divisors (see below), whose sum is σ = 18589344. Its totient is φ = 9237360.

The previous prime is 13899001. The next prime is 13899049. The reversal of 13899021 is 12099831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13899021 - 2⁶ = 13898957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13899001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6006 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (2323668).

Almost surely, 2^13899021 is an apocalyptic number.

It is an amenable number.

13899021 is a deficient number, since it is larger than the sum of its proper divisors (4690323).

13899021 is a wasteful number, since it uses less digits than its factorization.

13899021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14331.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 13899021 is about 3728.1390800237. The cubic root of 13899021 is about 240.4333663081.

The spelling of 13899021 in words is "thirteen million, eight hundred ninety-nine thousand, twenty-one".