13909390 has 32 divisors (see below), whose sum is σ = 28200960. Its totient is φ = 4893600.

The previous prime is 13909369. The next prime is 13909391. The reversal of 13909390 is 9390931.

It is a happy number.

It is a super-2 number, since 2×13909390² = 386942260344200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909391) 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 15 ways as a sum of consecutive naturals, for example, 1371 + ... + 5449.

It is an arithmetic number, because the mean of its divisors is an integer number (881280).

Almost surely, 2^13909390 is an apocalyptic number.

13909390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13909390 is an abundant number, since it is smaller than the sum of its proper divisors (14291570).

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

13909390 is a wasteful number, since it uses less digits than its factorization.

13909390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 13909390 is about 3729.5294609374. The cubic root of 13909390 is about 240.4931411146.

The spelling of 13909390 in words is "thirteen million, nine hundred nine thousand, three hundred ninety".