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309625 = 532477
BaseRepresentation
bin1001011100101111001
3120201201121
41023211321
534402000
610345241
72426461
oct1134571
9521647
10309625
111a1698
1212b221
13aac14
1480ba1
1561b1a
hex4b979

309625 has 8 divisors (see below), whose sum is σ = 386568. Its totient is φ = 247600.

The previous prime is 309623. The next prime is 309629. The reversal of 309625 is 526903.

It can be written as a sum of positive squares in 4 ways, for example, as 13689 + 295936 = 117^2 + 544^2 .

It is not a de Polignac number, because 309625 - 21 = 309623 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309625.

It is not an unprimeable number, because it can be changed into a prime (309623) 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, 1114 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (48321).

2309625 is an apocalyptic number.

It is an amenable number.

309625 is a deficient number, since it is larger than the sum of its proper divisors (76943).

309625 is an equidigital number, since it uses as much as digits as its factorization.

309625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492 (or 2482 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 309625 is about 556.4395744373. The cubic root of 309625 is about 67.6516935925.

The spelling of 309625 in words is "three hundred nine thousand, six hundred twenty-five".

Divisors: 1 5 25 125 2477 12385 61925 309625