1377640379 has 2 divisors, whose sum is σ = 1377640380. Its totient is φ = 1377640378.

The previous prime is 1377640333. The next prime is 1377640421. The reversal of 1377640379 is 9730467731.

It is a strong prime.

It is an emirp because it is prime and its reverse (9730467731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377640379 - 2⁸ = 1377640123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377940379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688820189 + 688820190.

It is an arithmetic number, because the mean of its divisors is an integer number (688820190).

Almost surely, 2^1377640379 is an apocalyptic number.

1377640379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377640379 is an equidigital number, since it uses as much as digits as its factorization.

1377640379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 666792, while the sum is 47.

The square root of 1377640379 is about 37116.5782232145. The cubic root of 1377640379 is about 1112.7013659655.

The spelling of 1377640379 in words is "one billion, three hundred seventy-seven million, six hundred forty thousand, three hundred seventy-nine".