378987977 has 2 divisors, whose sum is σ = 378987978. Its totient is φ = 378987976.

The previous prime is 378987967. The next prime is 378988007. The reversal of 378987977 is 779789873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377758096 + 1229881 = 19436^2 + 1109^2 .

It is an emirp because it is prime and its reverse (779789873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378987977 - 2¹⁰ = 378986953 is a prime.

It is not a weakly prime, because it can be changed into another prime (378987967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189493988 + 189493989.

It is an arithmetic number, because the mean of its divisors is an integer number (189493989).

Almost surely, 2^378987977 is an apocalyptic number.

It is an amenable number.

378987977 is a deficient number, since it is larger than the sum of its proper divisors (1).

378987977 is an equidigital number, since it uses as much as digits as its factorization.

378987977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 65.

The square root of 378987977 is about 19467.6135414693. The cubic root of 378987977 is about 723.6720690895.

The spelling of 378987977 in words is "three hundred seventy-eight million, nine hundred eighty-seven thousand, nine hundred seventy-seven".