1138640077 has 2 divisors, whose sum is σ = 1138640078. Its totient is φ = 1138640076.

The previous prime is 1138640039. The next prime is 1138640099. The reversal of 1138640077 is 7700468311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816473476 + 322166601 = 28574^2 + 17949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138640077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138644077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569320038 + 569320039.

It is an arithmetic number, because the mean of its divisors is an integer number (569320039).

Almost surely, 2^1138640077 is an apocalyptic number.

It is an amenable number.

1138640077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138640077 is an equidigital number, since it uses as much as digits as its factorization.

1138640077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 1138640077 is about 33743.7413011658. The cubic root of 1138640077 is about 1044.2283710982.

The spelling of 1138640077 in words is "one billion, one hundred thirty-eight million, six hundred forty thousand, seventy-seven".