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30872 = 2317227
BaseRepresentation
bin111100010011000
31120100102
413202120
51441442
6354532
7156002
oct74230
946312
1030872
1121216
1215a48
131108a
14b372
159232
hex7898

30872 has 16 divisors (see below), whose sum is σ = 61560. Its totient is φ = 14464.

The previous prime is 30871. The next prime is 30881. The reversal of 30872 is 27803.

30872 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 249.

230872 is an apocalyptic number.

It is an amenable number.

30872 is a deficient number, since it is larger than the sum of its proper divisors (30688).

30872 is a wasteful number, since it uses less digits than its factorization.

30872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 30872 is about 175.7042970448. The cubic root of 30872 is about 31.3705106723.

The spelling of 30872 in words is "thirty thousand, eight hundred seventy-two".

Divisors: 1 2 4 8 17 34 68 136 227 454 908 1816 3859 7718 15436 30872