13781016 has 112 divisors (see below), whose sum is σ = 41315400. Its totient is φ = 4292352.

The previous prime is 13780993. The next prime is 13781039. The reversal of 13781016 is 61018731.

It is an interprime number because it is at equal distance from previous prime (13780993) and next prime (13781039).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 99075 + ... + 99213.

Almost surely, 2^13781016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13781016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20657700).

13781016 is an abundant number, since it is smaller than the sum of its proper divisors (27534384).

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

13781016 is a wasteful number, since it uses less digits than its factorization.

13781016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 13781016 is about 3712.2790843362. The cubic root of 13781016 is about 239.7509917347.

Adding to 13781016 its reverse (61018731), we get a palindrome (74799747).

The spelling of 13781016 in words is "thirteen million, seven hundred eighty-one thousand, sixteen".