30155420 has 12 divisors (see below), whose sum is σ = 63326424. Its totient is φ = 12062160.

The previous prime is 30155417. The next prime is 30155441. The reversal of 30155420 is 2455103.

30155420 = 1938² + 1939² + ... + 1945².

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1507771 = 30155420 / (3 + 0 + 1 + 5 + 5 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 30155392 and 30155401.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 753866 + ... + 753905.

It is an arithmetic number, because the mean of its divisors is an integer number (5277202).

Almost surely, 2^30155420 is an apocalyptic number.

It is an amenable number.

30155420 is an abundant number, since it is smaller than the sum of its proper divisors (33171004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30155420 is a wasteful number, since it uses less digits than its factorization.

30155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507780 (or 1507778 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 30155420 is about 5491.3950868609. The cubic root of 30155420 is about 311.2589111603.

The spelling of 30155420 in words is "thirty million, one hundred fifty-five thousand, four hundred twenty".