378420409 has 2 divisors, whose sum is σ = 378420410. Its totient is φ = 378420408.

The previous prime is 378420407. The next prime is 378420431. The reversal of 378420409 is 904024873.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335805625 + 42614784 = 18325^2 + 6528^2 .

It is a cyclic number.

It is not a de Polignac number, because 378420409 - 2¹ = 378420407 is a prime.

Together with 378420407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (378420407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189210204 + 189210205.

It is an arithmetic number, because the mean of its divisors is an integer number (189210205).

Almost surely, 2^378420409 is an apocalyptic number.

It is an amenable number.

378420409 is a deficient number, since it is larger than the sum of its proper divisors (1).

378420409 is an equidigital number, since it uses as much as digits as its factorization.

378420409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 378420409 is about 19453.0308435472. The cubic root of 378420409 is about 723.3106343027.

The spelling of 378420409 in words is "three hundred seventy-eight million, four hundred twenty thousand, four hundred nine".