1390376021777 has 2 divisors, whose sum is σ = 1390376021778. Its totient is φ = 1390376021776.

The previous prime is 1390376021747. The next prime is 1390376021791. The reversal of 1390376021777 is 7771206730931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1366165906561 + 24210115216 = 1168831^2 + 155596^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390376021777 - 2¹⁶ = 1390375956241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390376021747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695188010888 + 695188010889.

It is an arithmetic number, because the mean of its divisors is an integer number (695188010889).

Almost surely, 2^{1390376021777} is an apocalyptic number.

It is an amenable number.

1390376021777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390376021777 is an equidigital number, since it uses as much as digits as its factorization.

1390376021777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2333772, while the sum is 53.

The spelling of 1390376021777 in words is "one trillion, three hundred ninety billion, three hundred seventy-six million, twenty-one thousand, seven hundred seventy-seven".