30186428 has 6 divisors (see below), whose sum is σ = 52826256. Its totient is φ = 15093212.

The previous prime is 30186379. The next prime is 30186437. The reversal of 30186428 is 82468103.

It is a super-2 number, since 2×30186428² = 1822440870798368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30186394 and 30186403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3773300 + ... + 3773307.

It is an arithmetic number, because the mean of its divisors is an integer number (8804376).

Almost surely, 2^30186428 is an apocalyptic number.

It is an amenable number.

30186428 is a deficient number, since it is larger than the sum of its proper divisors (22639828).

30186428 is a wasteful number, since it uses less digits than its factorization.

30186428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7546611 (or 7546609 counting only the distinct ones).

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

The square root of 30186428 is about 5494.2176877150. The cubic root of 30186428 is about 311.3655609773.

It can be divided in two parts, 30 and 186428, that multiplied together give a triangular number (5592840 = T₃₃₄₄).

The spelling of 30186428 in words is "thirty million, one hundred eighty-six thousand, four hundred twenty-eight".