30686042 has 4 divisors (see below), whose sum is σ = 46029066. Its totient is φ = 15343020.

The previous prime is 30686041. The next prime is 30686053. The reversal of 30686042 is 24068603.

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

It can be written as a sum of positive squares in only one way, i.e., 29495761 + 1190281 = 5431^2 + 1091^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30685996 and 30686014.

It is not an unprimeable number, because it can be changed into a prime (30686041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7671509 + ... + 7671512.

Almost surely, 2^30686042 is an apocalyptic number.

30686042 is a deficient number, since it is larger than the sum of its proper divisors (15343024).

30686042 is a wasteful number, since it uses less digits than its factorization.

30686042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343023.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 30686042 is about 5539.4983527392. The cubic root of 30686042 is about 313.0739685071.

The spelling of 30686042 in words is "thirty million, six hundred eighty-six thousand, forty-two".