30012142 has 4 divisors (see below), whose sum is σ = 45018216.
Its totient is φ = 15006070.
The previous prime is 30012139. The next prime is 30012149. The reversal of 30012142 is 24121003.
Adding to 30012142 its reverse (24121003), we get a palindrome (54133145).
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (30012149) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7503034 + ... + 7503037.
It is an arithmetic number, because the mean of its divisors is an integer number (11254554).
Almost surely, 230012142 is an apocalyptic number.
30012142 is a deficient number, since it is larger than the sum of its proper divisors (15006074).
30012142 is a wasteful number, since it uses less digits than its factorization.
30012142 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 15006073.
The product of its (nonzero) digits is 48, while the sum is 13.
The square root of 30012142 is about 5478.3338708042.
Note that the first 3 decimals coincide.
The cubic root of 30012142 is about 310.7651649602.
The spelling of 30012142 in words is "thirty million, twelve thousand, one hundred forty-two".