30189856 has 24 divisors (see below), whose sum is σ = 59750460. Its totient is φ = 15015168.

The previous prime is 30189851. The next prime is 30189881. The reversal of 30189856 is 65898103.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30074256 + 115600 = 5484^2 + 340^2 .

It is a super-2 number, since 2×30189856² = 1822854810601472, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (30189851) 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, 3910 + ... + 8698.

Almost surely, 2^30189856 is an apocalyptic number.

It is an amenable number.

30189856 is a deficient number, since it is larger than the sum of its proper divisors (29560604).

30189856 is a wasteful number, since it uses less digits than its factorization.

30189856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4996 (or 4988 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 30189856 is about 5494.5296431997. The cubic root of 30189856 is about 311.3773468561.

The spelling of 30189856 in words is "thirty million, one hundred eighty-nine thousand, eight hundred fifty-six".