385918409 has 2 divisors, whose sum is σ = 385918410. Its totient is φ = 385918408.

The previous prime is 385918373. The next prime is 385918417. The reversal of 385918409 is 904819583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232654009 + 153264400 = 15253^2 + 12380^2 .

It is a cyclic number.

It is not a de Polignac number, because 385918409 - 2⁸ = 385918153 is a prime.

It is not a weakly prime, because it can be changed into another prime (385912409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192959204 + 192959205.

It is an arithmetic number, because the mean of its divisors is an integer number (192959205).

Almost surely, 2^385918409 is an apocalyptic number.

It is an amenable number.

385918409 is a deficient number, since it is larger than the sum of its proper divisors (1).

385918409 is an equidigital number, since it uses as much as digits as its factorization.

385918409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 385918409 is about 19644.8061583717. The cubic root of 385918409 is about 728.0566369262.

The spelling of 385918409 in words is "three hundred eighty-five million, nine hundred eighteen thousand, four hundred nine".