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30986 = 215493
BaseRepresentation
bin111100100001010
31120111122
413210022
51442421
6355242
7156224
oct74412
946448
1030986
112130a
1215b22
1311147
14b414
1592ab
hex790a

30986 has 4 divisors (see below), whose sum is σ = 46482. Its totient is φ = 15492.

The previous prime is 30983. The next prime is 31013. The reversal of 30986 is 68903.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 30625 + 361 = 175^2 + 19^2 .

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (30983) 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 as a sum of consecutive naturals, namely, 7745 + ... + 7748.

230986 is an apocalyptic number.

30986 is a deficient number, since it is larger than the sum of its proper divisors (15496).

30986 is a wasteful number, since it uses less digits than its factorization.

30986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15495.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 30986 is about 176.0284067984. The cubic root of 30986 is about 31.4090768517.

The spelling of 30986 in words is "thirty thousand, nine hundred eighty-six".

Divisors: 1 2 15493 30986