30818642 has 4 divisors (see below), whose sum is σ = 46227966. Its totient is φ = 15409320.

The previous prime is 30818633. The next prime is 30818651. The reversal of 30818642 is 24681803.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (30818633) and next prime (30818651).

It can be written as a sum of positive squares in only one way, i.e., 30813601 + 5041 = 5551^2 + 71^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30818599 and 30818608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7704659 + ... + 7704662.

Almost surely, 2^30818642 is an apocalyptic number.

30818642 is a deficient number, since it is larger than the sum of its proper divisors (15409324).

30818642 is a wasteful number, since it uses less digits than its factorization.

30818642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15409323.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 30818642 is about 5551.4540437619. The cubic root of 30818642 is about 313.5242704760.

The spelling of 30818642 in words is "thirty million, eight hundred eighteen thousand, six hundred forty-two".