13780356 has 24 divisors (see below), whose sum is σ = 32596704. Its totient is φ = 4530240.

The previous prime is 13780331. The next prime is 13780369. The reversal of 13780356 is 65308731.

It is a happy number.

It is a super-4 number, since 4×13780356⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6990 + ... + 8741.

It is an arithmetic number, because the mean of its divisors is an integer number (1358196).

Almost surely, 2^13780356 is an apocalyptic number.

It is an amenable number.

13780356 is an abundant number, since it is smaller than the sum of its proper divisors (18816348).

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

13780356 is a wasteful number, since it uses less digits than its factorization.

13780356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15811 (or 15809 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 13780356 is about 3712.1901890932. The cubic root of 13780356 is about 239.7471642912.

The spelling of 13780356 in words is "thirteen million, seven hundred eighty thousand, three hundred fifty-six".