13491890 has 8 divisors (see below), whose sum is σ = 24285420. Its totient is φ = 5396752.

The previous prime is 13491889. The next prime is 13491893. The reversal of 13491890 is 9819431.

It can be written as a sum of positive squares in 2 ways, for example, as 13490929 + 961 = 3673^2 + 31^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 13491890.

It is not an unprimeable number, because it can be changed into a prime (13491893) 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, 674585 + ... + 674604.

Almost surely, 2^13491890 is an apocalyptic number.

13491890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13491890 is a deficient number, since it is larger than the sum of its proper divisors (10793530).

13491890 is a wasteful number, since it uses less digits than its factorization.

13491890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349196.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 13491890 is about 3673.1308171640. The cubic root of 13491890 is about 238.0624674199.

The spelling of 13491890 in words is "thirteen million, four hundred ninety-one thousand, eight hundred ninety".