390889973 has 2 divisors, whose sum is σ = 390889974. Its totient is φ = 390889972.

The previous prime is 390889969. The next prime is 390889981. The reversal of 390889973 is 379988093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390181009 + 708964 = 19753^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 390889973 - 2² = 390889969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390889903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195444986 + 195444987.

It is an arithmetic number, because the mean of its divisors is an integer number (195444987).

Almost surely, 2^390889973 is an apocalyptic number.

It is an amenable number.

390889973 is a deficient number, since it is larger than the sum of its proper divisors (1).

390889973 is an equidigital number, since it uses as much as digits as its factorization.

390889973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 390889973 is about 19770.9375852538. The cubic root of 390889973 is about 731.1696848212.

The spelling of 390889973 in words is "three hundred ninety million, eight hundred eighty-nine thousand, nine hundred seventy-three".