390544191409 has 2 divisors, whose sum is σ = 390544191410. Its totient is φ = 390544191408.

The previous prime is 390544191383. The next prime is 390544191469. The reversal of 390544191409 is 904191445093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356972790784 + 33571400625 = 597472^2 + 183225^2 .

It is a cyclic number.

It is not a de Polignac number, because 390544191409 - 2⁵ = 390544191377 is a prime.

It is not a weakly prime, because it can be changed into another prime (390544191469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195272095704 + 195272095705.

It is an arithmetic number, because the mean of its divisors is an integer number (195272095705).

Almost surely, 2^390544191409 is an apocalyptic number.

It is an amenable number.

390544191409 is a deficient number, since it is larger than the sum of its proper divisors (1).

390544191409 is an equidigital number, since it uses as much as digits as its factorization.

390544191409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 390544191409 in words is "three hundred ninety billion, five hundred forty-four million, one hundred ninety-one thousand, four hundred nine".