309420473 has 2 divisors, whose sum is σ = 309420474. Its totient is φ = 309420472.

The previous prime is 309420457. The next prime is 309420479. The reversal of 309420473 is 374024903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235683904 + 73736569 = 15352^2 + 8587^2 .

It is a cyclic number.

It is not a de Polignac number, because 309420473 - 2⁴ = 309420457 is a prime.

It is a super-2 number, since 2×309420473² = 191482058223087458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (309420479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154710236 + 154710237.

It is an arithmetic number, because the mean of its divisors is an integer number (154710237).

Almost surely, 2^309420473 is an apocalyptic number.

It is an amenable number.

309420473 is a deficient number, since it is larger than the sum of its proper divisors (1).

309420473 is an equidigital number, since it uses as much as digits as its factorization.

309420473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 309420473 is about 17590.3517019985. The cubic root of 309420473 is about 676.3679422963.

The spelling of 309420473 in words is "three hundred nine million, four hundred twenty thousand, four hundred seventy-three".