30742 has 8 divisors (see below), whose sum is σ = 48600. Its totient is φ = 14544.

The previous prime is 30727. The next prime is 30757. The reversal of 30742 is 24703.

It is an interprime number because it is at equal distance from previous prime (30727) and next prime (30757).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

30742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367 + ... + 442.

It is an arithmetic number, because the mean of its divisors is an integer number (6075).

2³⁰⁷⁴² is an apocalyptic number.

30742 is a deficient number, since it is larger than the sum of its proper divisors (17858).

30742 is a wasteful number, since it uses less digits than its factorization.

30742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 30742 is about 175.3339670457. Note that the first 3 decimals coincide. The cubic root of 30742 is about 31.3264156551.

The spelling of 30742 in words is "thirty thousand, seven hundred forty-two".