13897820 has 24 divisors (see below), whose sum is σ = 29274000. Its totient is φ = 5542272.

The previous prime is 13897787. The next prime is 13897831. The reversal of 13897820 is 2879831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7331 + ... + 9029.

It is an arithmetic number, because the mean of its divisors is an integer number (1219750).

Almost surely, 2^13897820 is an apocalyptic number.

13897820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13897820 is an abundant number, since it is smaller than the sum of its proper divisors (15376180).

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

13897820 is a wasteful number, since it uses less digits than its factorization.

13897820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 13897820 is about 3727.9780042270. The cubic root of 13897820 is about 240.4264409093.

The spelling of 13897820 in words is "thirteen million, eight hundred ninety-seven thousand, eight hundred twenty".