13909690 has 8 divisors (see below), whose sum is σ = 25037460. Its totient is φ = 5563872.

The previous prime is 13909673. The next prime is 13909699. The reversal of 13909690 is 9690931.

It can be written as a sum of positive squares in 2 ways, for example, as 13638249 + 271441 = 3693^2 + 521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13909690² = 386958951792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13909699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695475 + ... + 695494.

Almost surely, 2^13909690 is an apocalyptic number.

13909690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13909690 is a deficient number, since it is larger than the sum of its proper divisors (11127770).

13909690 is a wasteful number, since it uses less digits than its factorization.

13909690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390976.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 13909690 is about 3729.5696802714. The cubic root of 13909690 is about 240.4948701006.

The spelling of 13909690 in words is "thirteen million, nine hundred nine thousand, six hundred ninety".