30142755 has 12 divisors (see below), whose sum is σ = 52247520. Its totient is φ = 16076112.

The previous prime is 30142747. The next prime is 30142789. The reversal of 30142755 is 55724103.

It is a happy number.

It is not a de Polignac number, because 30142755 - 2³ = 30142747 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334875 + ... + 334964.

It is an arithmetic number, because the mean of its divisors is an integer number (4353960).

Almost surely, 2^30142755 is an apocalyptic number.

30142755 is a deficient number, since it is larger than the sum of its proper divisors (22104765).

30142755 is a wasteful number, since it uses less digits than its factorization.

30142755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669850 (or 669847 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 30142755 is about 5490.2417979539. The cubic root of 30142755 is about 311.2153297619.

Adding to 30142755 its reverse (55724103), we get a palindrome (85866858).

The spelling of 30142755 in words is "thirty million, one hundred forty-two thousand, seven hundred fifty-five".