308945797 has 4 divisors (see below), whose sum is σ = 309724396. Its totient is φ = 308167200.

The previous prime is 308945737. The next prime is 308945807. The reversal of 308945797 is 797549803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797549803 = 31 ⋅25727413.

It can be written as a sum of positive squares in 2 ways, for example, as 189502756 + 119443041 = 13766^2 + 10929^2 .

It is a cyclic number.

It is not a de Polignac number, because 308945797 - 2¹⁵ = 308913029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308945717) 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, 388704 + ... + 389497.

It is an arithmetic number, because the mean of its divisors is an integer number (77431099).

Almost surely, 2^308945797 is an apocalyptic number.

It is an amenable number.

308945797 is a deficient number, since it is larger than the sum of its proper divisors (778599).

308945797 is an equidigital number, since it uses as much as digits as its factorization.

308945797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778598.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 308945797 is about 17576.8540131617. The cubic root of 308945797 is about 676.0218975960.

The spelling of 308945797 in words is "three hundred eight million, nine hundred forty-five thousand, seven hundred ninety-seven".