378921973 has 2 divisors, whose sum is σ = 378921974. Its totient is φ = 378921972.

The previous prime is 378921953. The next prime is 378922031. The reversal of 378921973 is 379129873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378185809 + 736164 = 19447^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 378921973 - 2¹⁷ = 378790901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378921953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189460986 + 189460987.

It is an arithmetic number, because the mean of its divisors is an integer number (189460987).

Almost surely, 2^378921973 is an apocalyptic number.

It is an amenable number.

378921973 is a deficient number, since it is larger than the sum of its proper divisors (1).

378921973 is an equidigital number, since it uses as much as digits as its factorization.

378921973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 378921973 is about 19465.9182418914. The cubic root of 378921973 is about 723.6300554222.

The spelling of 378921973 in words is "three hundred seventy-eight million, nine hundred twenty-one thousand, nine hundred seventy-three".