13778985 has 48 divisors (see below), whose sum is σ = 25123392. Its totient is φ = 6393600.

The previous prime is 13778983. The next prime is 13779011. The reversal of 13778985 is 58987731.

It is not a de Polignac number, because 13778985 - 2¹ = 13778983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13778983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 225855 + ... + 225915.

It is an arithmetic number, because the mean of its divisors is an integer number (523404).

Almost surely, 2^13778985 is an apocalyptic number.

13778985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13778985 is a deficient number, since it is larger than the sum of its proper divisors (11344407).

13778985 is a wasteful number, since it uses less digits than its factorization.

13778985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 117 counting only the distinct ones).

The product of its digits is 423360, while the sum is 48.

The square root of 13778985 is about 3712.0055226252. The cubic root of 13778985 is about 239.7392132566.

The spelling of 13778985 in words is "thirteen million, seven hundred seventy-eight thousand, nine hundred eighty-five".