13640777 has 2 divisors, whose sum is σ = 13640778. Its totient is φ = 13640776.

The previous prime is 13640747. The next prime is 13640791. The reversal of 13640777 is 77704631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 817216 = 3581^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 13640777 - 2⁸ = 13640521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13640747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820388 + 6820389.

It is an arithmetic number, because the mean of its divisors is an integer number (6820389).

Almost surely, 2^13640777 is an apocalyptic number.

It is an amenable number.

13640777 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640777 is an equidigital number, since it uses as much as digits as its factorization.

13640777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 35.

The square root of 13640777 is about 3693.3422532985. The cubic root of 13640777 is about 238.9349624332.

The spelling of 13640777 in words is "thirteen million, six hundred forty thousand, seven hundred seventy-seven".