30142757 has 4 divisors (see below), whose sum is σ = 31115136. Its totient is φ = 29170380.

The previous prime is 30142747. The next prime is 30142789. The reversal of 30142757 is 75724103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30142757 - 2⁸ = 30142501 is a prime.

It is a super-2 number, since 2×30142757² = 1817171599122098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30142727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486143 + ... + 486204.

It is an arithmetic number, because the mean of its divisors is an integer number (7778784).

Almost surely, 2^30142757 is an apocalyptic number.

It is an amenable number.

30142757 is a deficient number, since it is larger than the sum of its proper divisors (972379).

30142757 is an equidigital number, since it uses as much as digits as its factorization.

30142757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972378.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 30142757 is about 5490.2419800952. The cubic root of 30142757 is about 311.2153366450.

The spelling of 30142757 in words is "thirty million, one hundred forty-two thousand, seven hundred fifty-seven".