305440238 has 16 divisors (see below), whose sum is σ = 498906000. Its totient is φ = 139692672.

The previous prime is 305440231. The next prime is 305440273. The reversal of 305440238 is 832044503.

It is a super-3 number, since 3×305440238³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 305440238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305440231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137483 + ... + 139686.

It is an arithmetic number, because the mean of its divisors is an integer number (31181625).

Almost surely, 2^305440238 is an apocalyptic number.

305440238 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

305440238 is a deficient number, since it is larger than the sum of its proper divisors (193465762).

305440238 is a wasteful number, since it uses less digits than its factorization.

305440238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277219.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 305440238 is about 17476.8486289720. The cubic root of 305440238 is about 673.4552607899.

The spelling of 305440238 in words is "three hundred five million, four hundred forty thousand, two hundred thirty-eight".