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30457 = 719229
BaseRepresentation
bin111011011111001
31112210001
413123321
51433312
6353001
7154540
oct73371
945701
1030457
1120979
1215761
1310b2b
14b157
159057
hex76f9

30457 has 8 divisors (see below), whose sum is σ = 36800. Its totient is φ = 24624.

The previous prime is 30449. The next prime is 30467. The reversal of 30457 is 75403.

It can be divided in two parts, 304 and 57, that added together give a square (361 = 192).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30457 - 23 = 30449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19 + ... + 247.

It is an arithmetic number, because the mean of its divisors is an integer number (4600).

230457 is an apocalyptic number.

It is an amenable number.

30457 is a deficient number, since it is larger than the sum of its proper divisors (6343).

30457 is a wasteful number, since it uses less digits than its factorization.

With its successor (30458) it forms an eRAP, since the sums of their prime factors are consecutive (255 and 256).

30457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 30457 is about 174.5193399025. The cubic root of 30457 is about 31.2293089699.

The spelling of 30457 in words is "thirty thousand, four hundred fifty-seven".

Divisors: 1 7 19 133 229 1603 4351 30457