1387943477 has 2 divisors, whose sum is σ = 1387943478. Its totient is φ = 1387943476.

The previous prime is 1387943467. The next prime is 1387943497. The reversal of 1387943477 is 7743497831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742072081 + 645871396 = 27241^2 + 25414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387943477 - 2¹⁶ = 1387877941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387943467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693971738 + 693971739.

It is an arithmetic number, because the mean of its divisors is an integer number (693971739).

Almost surely, 2^1387943477 is an apocalyptic number.

It is an amenable number.

1387943477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387943477 is an equidigital number, since it uses as much as digits as its factorization.

1387943477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

The square root of 1387943477 is about 37255.1134342656. The cubic root of 1387943477 is about 1115.4683700598.

The spelling of 1387943477 in words is "one billion, three hundred eighty-seven million, nine hundred forty-three thousand, four hundred seventy-seven".