30906838 has 4 divisors (see below), whose sum is σ = 46360260. Its totient is φ = 15453418.

The previous prime is 30906817. The next prime is 30906839. The reversal of 30906838 is 83860903.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 30906797 and 30906806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30906839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7726708 + ... + 7726711.

It is an arithmetic number, because the mean of its divisors is an integer number (11590065).

Almost surely, 2^30906838 is an apocalyptic number.

30906838 is a deficient number, since it is larger than the sum of its proper divisors (15453422).

30906838 is a wasteful number, since it uses less digits than its factorization.

30906838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15453421.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 30906838 is about 5559.3918732178. The cubic root of 30906838 is about 313.8230642049.

The spelling of 30906838 in words is "thirty million, nine hundred six thousand, eight hundred thirty-eight".