13781607 has 8 divisors (see below), whose sum is σ = 21000576. Its totient is φ = 7875192.

The previous prime is 13781591. The next prime is 13781653. The reversal of 13781607 is 70618731.

13781607 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13781607 - 2⁴ = 13781591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781687) 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, 328113 + ... + 328154.

It is an arithmetic number, because the mean of its divisors is an integer number (2625072).

Almost surely, 2^13781607 is an apocalyptic number.

13781607 is a deficient number, since it is larger than the sum of its proper divisors (7218969).

13781607 is an equidigital number, since it uses as much as digits as its factorization.

13781607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656277.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 13781607 is about 3712.3586841791. The cubic root of 13781607 is about 239.7544189327.

The spelling of 13781607 in words is "thirteen million, seven hundred eighty-one thousand, six hundred seven".