13920786 has 48 divisors (see below), whose sum is σ = 33179328. Its totient is φ = 4183200.

The previous prime is 13920779. The next prime is 13920793. The reversal of 13920786 is 68702931.

13920786 = 705² + 706² + ... + 731².

It is an interprime number because it is at equal distance from previous prime (13920779) and next prime (13920793).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13920786.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32856 + ... + 33276.

It is an arithmetic number, because the mean of its divisors is an integer number (691236).

Almost surely, 2^13920786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13920786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16589664).

13920786 is an abundant number, since it is smaller than the sum of its proper divisors (19258542).

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

13920786 is a wasteful number, since it uses less digits than its factorization.

13920786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 13920786 is about 3731.0569548052. The cubic root of 13920786 is about 240.5588020746.

It can be divided in two parts, 13920 and 786, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 13920786 in words is "thirteen million, nine hundred twenty thousand, seven hundred eighty-six".