390856093 has 2 divisors, whose sum is σ = 390856094. Its totient is φ = 390856092.

The previous prime is 390856069. The next prime is 390856133. The reversal of 390856093 is 390658093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385847449 + 5008644 = 19643^2 + 2238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390856093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390856003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195428046 + 195428047.

It is an arithmetic number, because the mean of its divisors is an integer number (195428047).

Almost surely, 2^390856093 is an apocalyptic number.

It is an amenable number.

390856093 is a deficient number, since it is larger than the sum of its proper divisors (1).

390856093 is an equidigital number, since it uses as much as digits as its factorization.

390856093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 390856093 is about 19770.0807535022. The cubic root of 390856093 is about 731.1485597422.

The spelling of 390856093 in words is "three hundred ninety million, eight hundred fifty-six thousand, ninety-three".