305550397 has 4 divisors (see below), whose sum is σ = 305695516. Its totient is φ = 305405280.

The previous prime is 305550383. The next prime is 305550407. The reversal of 305550397 is 793055503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793055503 = 383 ⋅2070641.

It can be written as a sum of positive squares in 2 ways, for example, as 108597241 + 196953156 = 10421^2 + 14034^2 .

It is a cyclic number.

It is not a de Polignac number, because 305550397 - 2⁷ = 305550269 is a prime.

It is a super-2 number, since 2×305550397² = 186722090213715218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305550997) 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, 69354 + ... + 73627.

It is an arithmetic number, because the mean of its divisors is an integer number (76423879).

Almost surely, 2^305550397 is an apocalyptic number.

It is an amenable number.

305550397 is a deficient number, since it is larger than the sum of its proper divisors (145119).

305550397 is a wasteful number, since it uses less digits than its factorization.

305550397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145118.

The product of its (nonzero) digits is 70875, while the sum is 37.

The square root of 305550397 is about 17479.9999141876. Note that the first 4 decimals coincide. The cubic root of 305550397 is about 673.5362130591.

The spelling of 305550397 in words is "three hundred five million, five hundred fifty thousand, three hundred ninety-seven".