305123142 has 16 divisors (see below), whose sum is σ = 629932032. Its totient is φ = 98426760.

The previous prime is 305123101. The next prime is 305123149. The reversal of 305123142 is 241321503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305123149) 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, 820038 + ... + 820409.

It is an arithmetic number, because the mean of its divisors is an integer number (39370752).

Almost surely, 2^305123142 is an apocalyptic number.

305123142 is an abundant number, since it is smaller than the sum of its proper divisors (324808890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

305123142 is a wasteful number, since it uses less digits than its factorization.

305123142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640483.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 305123142 is about 17467.7743859943. The cubic root of 305123142 is about 673.2221285377. Note that the first 3 decimals are identical.

Adding to 305123142 its reverse (241321503), we get a palindrome (546444645).

The spelling of 305123142 in words is "three hundred five million, one hundred twenty-three thousand, one hundred forty-two".