390903241 has 2 divisors, whose sum is σ = 390903242. Its totient is φ = 390903240.

The previous prime is 390903199. The next prime is 390903257. The reversal of 390903241 is 142309093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224880016 + 166023225 = 14996^2 + 12885^2 .

It is an emirp because it is prime and its reverse (142309093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390903241 is a prime.

It is not a weakly prime, because it can be changed into another prime (390903281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195451620 + 195451621.

It is an arithmetic number, because the mean of its divisors is an integer number (195451621).

Almost surely, 2^390903241 is an apocalyptic number.

It is an amenable number.

390903241 is a deficient number, since it is larger than the sum of its proper divisors (1).

390903241 is an equidigital number, since it uses as much as digits as its factorization.

390903241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 390903241 is about 19771.2731254211. The cubic root of 390903241 is about 731.1779574386.

The spelling of 390903241 in words is "three hundred ninety million, nine hundred three thousand, two hundred forty-one".