13929820 has 12 divisors (see below), whose sum is σ = 29252664. Its totient is φ = 5571920.

The previous prime is 13929809. The next prime is 13929829. The reversal of 13929820 is 2892931.

13929820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13929829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348226 + ... + 348265.

It is an arithmetic number, because the mean of its divisors is an integer number (2437722).

Almost surely, 2^13929820 is an apocalyptic number.

13929820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13929820 is an abundant number, since it is smaller than the sum of its proper divisors (15322844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13929820 is a wasteful number, since it uses less digits than its factorization.

13929820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696500 (or 696498 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13929820 is about 3732.2674073544. The cubic root of 13929820 is about 240.6108283103.

The spelling of 13929820 in words is "thirteen million, nine hundred twenty-nine thousand, eight hundred twenty".