309090673 has 4 divisors (see below), whose sum is σ = 309223408. Its totient is φ = 308957940.

The previous prime is 309090667. The next prime is 309090679. The reversal of 309090673 is 376090903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 376090903 = 37 ⋅10164619.

It is an interprime number because it is at equal distance from previous prime (309090667) and next prime (309090679).

It is a cyclic number.

It is not a de Polignac number, because 309090673 - 2⁹ = 309090161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309090679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62811 + ... + 67552.

It is an arithmetic number, because the mean of its divisors is an integer number (77305852).

Almost surely, 2^309090673 is an apocalyptic number.

It is an amenable number.

309090673 is a deficient number, since it is larger than the sum of its proper divisors (132735).

309090673 is a wasteful number, since it uses less digits than its factorization.

309090673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132734.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 309090673 is about 17580.9747454457. The cubic root of 309090673 is about 676.1275515589.

The spelling of 309090673 in words is "three hundred nine million, ninety thousand, six hundred seventy-three".