378691 has 2 divisors, whose sum is σ = 378692. Its totient is φ = 378690.

The previous prime is 378683. The next prime is 378713. The reversal of 378691 is 196873.

It is a weak prime.

It is an emirp because it is prime and its reverse (196873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378691 - 2³ = 378683 is a prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (378601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189345 + 189346.

It is an arithmetic number, because the mean of its divisors is an integer number (189346).

2³⁷⁸⁶⁹¹ is an apocalyptic number.

378691 is a deficient number, since it is larger than the sum of its proper divisors (1).

378691 is an equidigital number, since it uses as much as digits as its factorization.

378691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 378691 is about 615.3787451643. The cubic root of 378691 is about 72.3482995264.

The spelling of 378691 in words is "three hundred seventy-eight thousand, six hundred ninety-one".