378691667 has 2 divisors, whose sum is σ = 378691668. Its totient is φ = 378691666.

The previous prime is 378691517. The next prime is 378691681. The reversal of 378691667 is 766196873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 378691667 - 2¹⁰ = 378690643 is a prime.

It is not a weakly prime, because it can be changed into another prime (378691967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189345833 + 189345834.

It is an arithmetic number, because the mean of its divisors is an integer number (189345834).

Almost surely, 2^378691667 is an apocalyptic number.

378691667 is a deficient number, since it is larger than the sum of its proper divisors (1).

378691667 is an equidigital number, since it uses as much as digits as its factorization.

378691667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 378691667 is about 19460.0017214799. The cubic root of 378691667 is about 723.4834200275.

The spelling of 378691667 in words is "three hundred seventy-eight million, six hundred ninety-one thousand, six hundred sixty-seven".