30542818 has 4 divisors (see below), whose sum is σ = 45814230. Its totient is φ = 15271408.

The previous prime is 30542807. The next prime is 30542819. The reversal of 30542818 is 81824503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81824503 = 383 ⋅213641.

It can be written as a sum of positive squares in only one way, i.e., 26594649 + 3948169 = 5157^2 + 1987^2 .

It is a super-2 number, since 2×30542818² = 1865727462762248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 30542818.

It is not an unprimeable number, because it can be changed into a prime (30542819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7635703 + ... + 7635706.

Almost surely, 2^30542818 is an apocalyptic number.

30542818 is a deficient number, since it is larger than the sum of its proper divisors (15271412).

30542818 is a wasteful number, since it uses less digits than its factorization.

30542818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15271411.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 30542818 is about 5526.5557085765. Note that the first 3 decimals coincide. The cubic root of 30542818 is about 312.5861283666.

The spelling of 30542818 in words is "thirty million, five hundred forty-two thousand, eight hundred eighteen".