1385441977 has 2 divisors, whose sum is σ = 1385441978. Its totient is φ = 1385441976.

The previous prime is 1385441963. The next prime is 1385442001. The reversal of 1385441977 is 7791445831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1075118521 + 310323456 = 32789^2 + 17616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385441977 - 2¹⁹ = 1384917689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1385441977.

It is not a weakly prime, because it can be changed into another prime (1385441927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692720988 + 692720989.

It is an arithmetic number, because the mean of its divisors is an integer number (692720989).

Almost surely, 2^1385441977 is an apocalyptic number.

It is an amenable number.

1385441977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385441977 is an equidigital number, since it uses as much as digits as its factorization.

1385441977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 1385441977 is about 37221.5257210126. The cubic root of 1385441977 is about 1114.7978283059.

The spelling of 1385441977 in words is "one billion, three hundred eighty-five million, four hundred forty-one thousand, nine hundred seventy-seven".