13781970 has 24 divisors (see below), whose sum is σ = 35833356. Its totient is φ = 3675168.

The previous prime is 13781959. The next prime is 13781983. The reversal of 13781970 is 7918731.

13781970 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13373649 + 408321 = 3657^2 + 639^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76477 + ... + 76656.

Almost surely, 2^13781970 is an apocalyptic number.

13781970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13781970 is an abundant number, since it is smaller than the sum of its proper divisors (22051386).

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

13781970 is a wasteful number, since it uses less digits than its factorization.

13781970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153146 (or 153143 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 13781970 is about 3712.4075746071. The cubic root of 13781970 is about 239.7565239143.

The spelling of 13781970 in words is "thirteen million, seven hundred eighty-one thousand, nine hundred seventy".