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30219984 = 2432209861
BaseRepresentation
bin111001101000…
…1111011010000
32002212100000200
41303101323100
530214014414
62555415200
7514602624
oct163217320
962770020
1030219984
11160707a3
12a154500
136351162
144029184
1529be109
hex1cd1ed0

30219984 has 30 divisors (see below), whose sum is σ = 84574386. Its totient is φ = 10073280.

The previous prime is 30219983. The next prime is 30220007. The reversal of 30219984 is 48991203.

It can be written as a sum of positive squares in only one way, i.e., 24800400 + 5419584 = 4980^2 + 2328^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30219983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104787 + ... + 105074.

Almost surely, 230219984 is an apocalyptic number.

It is an amenable number.

30219984 is an abundant number, since it is smaller than the sum of its proper divisors (54354402).

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

30219984 is a wasteful number, since it uses less digits than its factorization.

30219984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209875 (or 209866 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 30219984 is about 5497.2705954865. The cubic root of 30219984 is about 311.4808922079.

The spelling of 30219984 in words is "thirty million, two hundred nineteen thousand, nine hundred eighty-four".