1387020377 has 2 divisors, whose sum is σ = 1387020378. Its totient is φ = 1387020376.

The previous prime is 1387020373. The next prime is 1387020389. The reversal of 1387020377 is 7730207831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026817936 + 360202441 = 32044^2 + 18979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387020377 - 2² = 1387020373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387020377.

It is not a weakly prime, because it can be changed into another prime (1387020373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693510188 + 693510189.

It is an arithmetic number, because the mean of its divisors is an integer number (693510189).

Almost surely, 2^1387020377 is an apocalyptic number.

It is an amenable number.

1387020377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387020377 is an equidigital number, since it uses as much as digits as its factorization.

1387020377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 1387020377 is about 37242.7224703028. The cubic root of 1387020377 is about 1115.2210215593.

The spelling of 1387020377 in words is "one billion, three hundred eighty-seven million, twenty thousand, three hundred seventy-seven".