13971890 has 8 divisors (see below), whose sum is σ = 25149420. Its totient is φ = 5588752.

The previous prime is 13971889. The next prime is 13971907. The reversal of 13971890 is 9817931.

13971890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13920361 + 51529 = 3731^2 + 227^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698585 + ... + 698604.

Almost surely, 2^13971890 is an apocalyptic number.

13971890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13971890 is a deficient number, since it is larger than the sum of its proper divisors (11177530).

13971890 is a wasteful number, since it uses less digits than its factorization.

13971890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397196.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 13971890 is about 3737.8991425666. The cubic root of 13971890 is about 240.8528109575.

The spelling of 13971890 in words is "thirteen million, nine hundred seventy-one thousand, eight hundred ninety".