30742157 has 4 divisors (see below), whose sum is σ = 30759456. Its totient is φ = 30724860.

The previous prime is 30742141. The next prime is 30742177. The reversal of 30742157 is 75124703.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75124703 = 29 ⋅2590507.

It is a cyclic number.

It is not a de Polignac number, because 30742157 - 2⁴ = 30742141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30742177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5633 + ... + 9654.

It is an arithmetic number, because the mean of its divisors is an integer number (7689864).

Almost surely, 2^30742157 is an apocalyptic number.

It is an amenable number.

30742157 is a deficient number, since it is larger than the sum of its proper divisors (17299).

30742157 is a wasteful number, since it uses less digits than its factorization.

30742157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17298.

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

The square root of 30742157 is about 5544.5610286117. The cubic root of 30742157 is about 313.2646898320.

The spelling of 30742157 in words is "thirty million, seven hundred forty-two thousand, one hundred fifty-seven".