13987780 has 24 divisors (see below), whose sum is σ = 29611008. Its totient is φ = 5550048.

The previous prime is 13987777. The next prime is 13987783. The reversal of 13987780 is 8778931.

It is an interprime number because it is at equal distance from previous prime (13987777) and next prime (13987783).

It is not an unprimeable number, because it can be changed into a prime (13987783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214 + ... + 5293.

It is an arithmetic number, because the mean of its divisors is an integer number (1233792).

Almost surely, 2^13987780 is an apocalyptic number.

13987780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13987780 is an abundant number, since it is smaller than the sum of its proper divisors (15623228).

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

13987780 is a wasteful number, since it uses less digits than its factorization.

13987780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643 (or 5641 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 13987780 is about 3740.0240640937. The cubic root of 13987780 is about 240.9440823420.

The spelling of 13987780 in words is "thirteen million, nine hundred eighty-seven thousand, seven hundred eighty".