390345247 has 2 divisors, whose sum is σ = 390345248. Its totient is φ = 390345246.

The previous prime is 390345233. The next prime is 390345251. The reversal of 390345247 is 742543093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 390345247 - 2²⁷ = 256127519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390345257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195172623 + 195172624.

It is an arithmetic number, because the mean of its divisors is an integer number (195172624).

Almost surely, 2^390345247 is an apocalyptic number.

390345247 is a deficient number, since it is larger than the sum of its proper divisors (1).

390345247 is an equidigital number, since it uses as much as digits as its factorization.

390345247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 390345247 is about 19757.1568551753. The cubic root of 390345247 is about 730.8298856278.

The spelling of 390345247 in words is "three hundred ninety million, three hundred forty-five thousand, two hundred forty-seven".