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31430 = 257449
BaseRepresentation
bin111101011000110
31121010002
413223012
52001210
6401302
7160430
oct75306
947102
1031430
1121683
1216232
13113c9
14b650
1594a5
hex7ac6

31430 has 16 divisors (see below), whose sum is σ = 64800. Its totient is φ = 10752.

The previous prime is 31397. The next prime is 31469. The reversal of 31430 is 3413.

It is a lonely number, since its distance to closest prime (31397) sets a new record.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

31430 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 294.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

231430 is an apocalyptic number.

31430 is an abundant number, since it is smaller than the sum of its proper divisors (33370).

It is a weird number, because it is abundant, but not a pseudoperfect number.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32400).

31430 is a wasteful number, since it uses less digits than its factorization.

31430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 31430 is about 177.2850811546. The cubic root of 31430 is about 31.5583867136.

Adding to 31430 its reverse (3413), we get a palindrome (34843).

The spelling of 31430 in words is "thirty-one thousand, four hundred thirty".

Divisors: 1 2 5 7 10 14 35 70 449 898 2245 3143 4490 6286 15715 31430