13869820 has 24 divisors (see below), whose sum is σ = 29915424. Its totient is φ = 5397696.

The previous prime is 13869811. The next prime is 13869827. The reversal of 13869820 is 2896831.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 13869820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13869827) 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, 8632 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (1246476).

Almost surely, 2^13869820 is an apocalyptic number.

13869820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13869820 is an abundant number, since it is smaller than the sum of its proper divisors (16045604).

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

13869820 is a wasteful number, since it uses less digits than its factorization.

13869820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18789 (or 18787 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 13869820 is about 3724.2207238562. The cubic root of 13869820 is about 240.2648696132.

The spelling of 13869820 in words is "thirteen million, eight hundred sixty-nine thousand, eight hundred twenty".