398931073 has 2 divisors, whose sum is σ = 398931074. Its totient is φ = 398931072.

The previous prime is 398931031. The next prime is 398931079. The reversal of 398931073 is 370139893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252714609 + 146216464 = 15897^2 + 12092^2 .

It is a cyclic number.

It is not a de Polignac number, because 398931073 - 2¹⁷ = 398800001 is a prime.

It is not a weakly prime, because it can be changed into another prime (398931079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199465536 + 199465537.

It is an arithmetic number, because the mean of its divisors is an integer number (199465537).

Almost surely, 2^398931073 is an apocalyptic number.

It is an amenable number.

398931073 is a deficient number, since it is larger than the sum of its proper divisors (1).

398931073 is an equidigital number, since it uses as much as digits as its factorization.

398931073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 398931073 is about 19973.2589479033. The cubic root of 398931073 is about 736.1493874311.

The spelling of 398931073 in words is "three hundred ninety-eight million, nine hundred thirty-one thousand, seventy-three".