390747971 has 2 divisors, whose sum is σ = 390747972. Its totient is φ = 390747970.

The previous prime is 390747961. The next prime is 390748019. The reversal of 390747971 is 179747093.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390747971 - 2¹⁰ = 390746947 is a prime.

It is not a weakly prime, because it can be changed into another prime (390747911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195373985 + 195373986.

It is an arithmetic number, because the mean of its divisors is an integer number (195373986).

Almost surely, 2^390747971 is an apocalyptic number.

390747971 is a deficient number, since it is larger than the sum of its proper divisors (1).

390747971 is an equidigital number, since it uses as much as digits as its factorization.

390747971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 390747971 is about 19767.3460788240. The cubic root of 390747971 is about 731.0811346408.

The spelling of 390747971 in words is "three hundred ninety million, seven hundred forty-seven thousand, nine hundred seventy-one".