390506999 has 2 divisors, whose sum is σ = 390507000. Its totient is φ = 390506998.

The previous prime is 390506971. The next prime is 390507023. The reversal of 390506999 is 999605093.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390506999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390506929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195253499 + 195253500.

It is an arithmetic number, because the mean of its divisors is an integer number (195253500).

Almost surely, 2^390506999 is an apocalyptic number.

390506999 is a deficient number, since it is larger than the sum of its proper divisors (1).

390506999 is an equidigital number, since it uses as much as digits as its factorization.

390506999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 590490, while the sum is 50.

The square root of 390506999 is about 19761.2499351635. The cubic root of 390506999 is about 730.9308192431.

The spelling of 390506999 in words is "three hundred ninety million, five hundred six thousand, nine hundred ninety-nine".