13780973 has 2 divisors, whose sum is σ = 13780974. Its totient is φ = 13780972.

The previous prime is 13780969. The next prime is 13780993. The reversal of 13780973 is 37908731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13446889 + 334084 = 3667^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 13780973 - 2² = 13780969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13780903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6890486 + 6890487.

It is an arithmetic number, because the mean of its divisors is an integer number (6890487).

Almost surely, 2^13780973 is an apocalyptic number.

It is an amenable number.

13780973 is a deficient number, since it is larger than the sum of its proper divisors (1).

13780973 is an equidigital number, since it uses as much as digits as its factorization.

13780973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 13780973 is about 3712.2732927413. The cubic root of 13780973 is about 239.7507423747.

The spelling of 13780973 in words is "thirteen million, seven hundred eighty thousand, nine hundred seventy-three".