13781830 has 16 divisors (see below), whose sum is σ = 25886304. Its totient is φ = 5272960.

The previous prime is 13781827. The next prime is 13781839. The reversal of 13781830 is 3818731.

It is a super-3 number, since 3×13781830³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13781792 and 13781801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781839) 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 7 ways as a sum of consecutive naturals, for example, 29731 + ... + 30190.

It is an arithmetic number, because the mean of its divisors is an integer number (1617894).

Almost surely, 2^13781830 is an apocalyptic number.

13781830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13781830 is a deficient number, since it is larger than the sum of its proper divisors (12104474).

13781830 is a wasteful number, since it uses less digits than its factorization.

13781830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59951.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 13781830 is about 3712.3887188709. The cubic root of 13781830 is about 239.7557120801.

The spelling of 13781830 in words is "thirteen million, seven hundred eighty-one thousand, eight hundred thirty".