13749220 has 12 divisors (see below), whose sum is σ = 28873404. Its totient is φ = 5499680.

The previous prime is 13749191. The next prime is 13749233. The reversal of 13749220 is 2294731.

It can be written as a sum of positive squares in 2 ways, for example, as 6031936 + 7717284 = 2456^2 + 2778^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 343711 + ... + 343750.

It is an arithmetic number, because the mean of its divisors is an integer number (2406117).

Almost surely, 2^13749220 is an apocalyptic number.

13749220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13749220 is an abundant number, since it is smaller than the sum of its proper divisors (15124184).

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

13749220 is a wasteful number, since it uses less digits than its factorization.

13749220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687470 (or 687468 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 13749220 is about 3707.9940668777. The cubic root of 13749220 is about 239.5664626978.

The spelling of 13749220 in words is "thirteen million, seven hundred forty-nine thousand, two hundred twenty".