13957866 has 64 divisors (see below), whose sum is σ = 34070400. Its totient is φ = 4209408.

The previous prime is 13957841. The next prime is 13957871. The reversal of 13957866 is 66875931.

It is a happy number.

13957866 is a `hidden beast` number, since 13 + 9 + 578 + 66 = 666.

Its product of digits (272160) is a multiple of the sum of its prime factors (420).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41250 + ... + 41586.

It is an arithmetic number, because the mean of its divisors is an integer number (532350).

Almost surely, 2^13957866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13957866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17035200).

13957866 is an abundant number, since it is smaller than the sum of its proper divisors (20112534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13957866 is a wasteful number, since it uses less digits than its factorization.

13957866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 414 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 13957866 is about 3736.0227515367. The cubic root of 13957866 is about 240.7722002800.

It can be divided in two parts, 1395 and 7866, that added together give a cube (9261 = 21³).

The spelling of 13957866 in words is "thirteen million, nine hundred fifty-seven thousand, eight hundred sixty-six".