13691890 has 16 divisors (see below), whose sum is σ = 24734808. Its totient is φ = 5456896.

The previous prime is 13691879. The next prime is 13691891. The reversal of 13691890 is 9819631.

It can be written as a sum of positive squares in 4 ways, for example, as 13549761 + 142129 = 3681^2 + 377^2 .

It is not an unprimeable number, because it can be changed into a prime (13691891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594 + ... + 5266.

Almost surely, 2^13691890 is an apocalyptic number.

13691890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13691890 is a deficient number, since it is larger than the sum of its proper divisors (11042918).

13691890 is a wasteful number, since it uses less digits than its factorization.

13691890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 13691890 is about 3700.2553965909. The cubic root of 13691890 is about 239.2330261107.

The spelling of 13691890 in words is "thirteen million, six hundred ninety-one thousand, eight hundred ninety".