378953921 has 2 divisors, whose sum is σ = 378953922. Its totient is φ = 378953920.

The previous prime is 378953891. The next prime is 378953929. The reversal of 378953921 is 129359873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192904321 + 186049600 = 13889^2 + 13640^2 .

It is a cyclic number.

It is not a de Polignac number, because 378953921 - 2²² = 374759617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378953929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189476960 + 189476961.

It is an arithmetic number, because the mean of its divisors is an integer number (189476961).

Almost surely, 2^378953921 is an apocalyptic number.

It is an amenable number.

378953921 is a deficient number, since it is larger than the sum of its proper divisors (1).

378953921 is an equidigital number, since it uses as much as digits as its factorization.

378953921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 378953921 is about 19466.7388383365. The cubic root of 378953921 is about 723.6503919602.

The spelling of 378953921 in words is "three hundred seventy-eight million, nine hundred fifty-three thousand, nine hundred twenty-one".