13991006 has 4 divisors (see below), whose sum is σ = 20986512. Its totient is φ = 6995502.

The previous prime is 13990987. The next prime is 13991009. The reversal of 13991006 is 60019931.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13991006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13991009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497750 + ... + 3497753.

It is an arithmetic number, because the mean of its divisors is an integer number (5246628).

Almost surely, 2^13991006 is an apocalyptic number.

13991006 is a deficient number, since it is larger than the sum of its proper divisors (6995506).

13991006 is an equidigital number, since it uses as much as digits as its factorization.

13991006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995505.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 13991006 is about 3740.4553198775. The cubic root of 13991006 is about 240.9626038863.

The spelling of 13991006 in words is "thirteen million, nine hundred ninety-one thousand, six".