30718493 has 4 divisors (see below), whose sum is σ = 33081468. Its totient is φ = 28355520.

The previous prime is 30718483. The next prime is 30718531. The reversal of 30718493 is 39481703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39481703 = 1973 ⋅20011.

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 19035769 = 3418^2 + 4363^2 .

It is a cyclic number.

It is not a de Polignac number, because 30718493 - 2⁴ = 30718477 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 (30718423) 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, 1181468 + ... + 1181493.

It is an arithmetic number, because the mean of its divisors is an integer number (8270367).

Almost surely, 2^30718493 is an apocalyptic number.

It is an amenable number.

30718493 is a deficient number, since it is larger than the sum of its proper divisors (2362975).

30718493 is a wasteful number, since it uses less digits than its factorization.

30718493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362974.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 30718493 is about 5542.4266346069. The cubic root of 30718493 is about 313.1842899376.

The spelling of 30718493 in words is "thirty million, seven hundred eighteen thousand, four hundred ninety-three".