308473997 has 4 divisors (see below), whose sum is σ = 332202780. Its totient is φ = 284745216.

The previous prime is 308473973. The next prime is 308474003. The reversal of 308473997 is 799374803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799374803 = 457 ⋅1749179.

It can be written as a sum of positive squares in 2 ways, for example, as 34703881 + 273770116 = 5891^2 + 16546^2 .

It is a cyclic number.

It is not a de Polignac number, because 308473997 - 2⁶ = 308473933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308473927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11864372 + ... + 11864397.

It is an arithmetic number, because the mean of its divisors is an integer number (83050695).

Almost surely, 2^308473997 is an apocalyptic number.

It is an amenable number.

308473997 is a deficient number, since it is larger than the sum of its proper divisors (23728783).

308473997 is a wasteful number, since it uses less digits than its factorization.

308473997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23728782.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 308473997 is about 17563.4278260253. The cubic root of 308473997 is about 675.6775981212.

The spelling of 308473997 in words is "three hundred eight million, four hundred seventy-three thousand, nine hundred ninety-seven".