13909810 has 16 divisors (see below), whose sum is σ = 25320600. Its totient is φ = 5501056.

The previous prime is 13909799. The next prime is 13909813. The reversal of 13909810 is 1890931.

It can be written as a sum of positive squares in 4 ways, for example, as 13039321 + 870489 = 3611^2 + 933^2 .

It is a super-2 number, since 2×13909810² = 386965628472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13909813) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6925 + ... + 8704.

Almost surely, 2^13909810 is an apocalyptic number.

13909810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13909810 is a deficient number, since it is larger than the sum of its proper divisors (11410790).

13909810 is a wasteful number, since it uses less digits than its factorization.

13909810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15725.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 13909810 is about 3729.5857678836. The cubic root of 13909810 is about 240.4955616881.

The spelling of 13909810 in words is "thirteen million, nine hundred nine thousand, eight hundred ten".