13791640 has 16 divisors (see below), whose sum is σ = 31031280. Its totient is φ = 5516640.

The previous prime is 13791637. The next prime is 13791643. The reversal of 13791640 is 4619731.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13791637) and next prime (13791643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13791643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172356 + ... + 172435.

It is an arithmetic number, because the mean of its divisors is an integer number (1939455).

Almost surely, 2^13791640 is an apocalyptic number.

13791640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13791640 is an abundant number, since it is smaller than the sum of its proper divisors (17239640).

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

13791640 is a wasteful number, since it uses less digits than its factorization.

13791640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344802 (or 344798 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 13791640 is about 3713.7097355609. The cubic root of 13791640 is about 239.8125851682.

The spelling of 13791640 in words is "thirteen million, seven hundred ninety-one thousand, six hundred forty".