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30757209 = 374093581
BaseRepresentation
bin111010101010…
…1000101011001
32010212121221220
41311111011121
530333212314
63015122253
7522301110
oct165250531
963777856
1030757209
11163a838a
12a373389
1364ab842
144128c77
152a783a9
hex1d55159

30757209 has 16 divisors (see below), whose sum is σ = 46995840. Its totient is φ = 17527680.

The previous prime is 30757201. The next prime is 30757211. The reversal of 30757209 is 90275703.

It is not a de Polignac number, because 30757209 - 23 = 30757201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30757209.

It is not an unprimeable number, because it can be changed into a prime (30757201) 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 15 ways as a sum of consecutive naturals, for example, 6799 + ... + 10379.

It is an arithmetic number, because the mean of its divisors is an integer number (2937240).

Almost surely, 230757209 is an apocalyptic number.

It is an amenable number.

30757209 is a deficient number, since it is larger than the sum of its proper divisors (16238631).

30757209 is a wasteful number, since it uses less digits than its factorization.

30757209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000.

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 30757209 is about 5545.9182287517. The cubic root of 30757209 is about 313.3158084610.

The spelling of 30757209 in words is "thirty million, seven hundred fifty-seven thousand, two hundred nine".

Divisors: 1 3 7 21 409 1227 2863 3581 8589 10743 25067 75201 1464629 4393887 10252403 30757209