13777920 has 264 divisors, whose sum is σ = 53647776. Its totient is φ = 3244032.

The previous prime is 13777913. The next prime is 13777921. The reversal of 13777920 is 2977731.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13777921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 599029 + ... + 599051.

Almost surely, 2^13777920 is an apocalyptic number.

13777920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13777920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26823888).

13777920 is an abundant number, since it is smaller than the sum of its proper divisors (39869856).

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

13777920 is a wasteful number, since it uses less digits than its factorization.

13777920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 13777920 is about 3711.8620664028. The cubic root of 13777920 is about 239.7330364871.

The spelling of 13777920 in words is "thirteen million, seven hundred seventy-seven thousand, nine hundred twenty".