1377638887 has 2 divisors, whose sum is σ = 1377638888. Its totient is φ = 1377638886.

The previous prime is 1377638767. The next prime is 1377638903. The reversal of 1377638887 is 7888367731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1377638887 - 2²³ = 1369250279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377608887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688819443 + 688819444.

It is an arithmetic number, because the mean of its divisors is an integer number (688819444).

Almost surely, 2^1377638887 is an apocalyptic number.

1377638887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377638887 is an equidigital number, since it uses as much as digits as its factorization.

1377638887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 58.

The square root of 1377638887 is about 37116.5581243735. The cubic root of 1377638887 is about 1112.7009642760.

The spelling of 1377638887 in words is "one billion, three hundred seventy-seven million, six hundred thirty-eight thousand, eight hundred eighty-seven".