Search a number
128392943 = 718341849
BaseRepresentation
bin1111010011100…
…01111011101111
322221121001000012
413221301323233
5230332033233
620423523435
73116215310
oct751617357
9287531005
10128392943
1166524578
1236bb957b
13207a5173
14130a2607
15b412548
hex7a71eef

128392943 has 4 divisors (see below), whose sum is σ = 146734800. Its totient is φ = 110051088.

The previous prime is 128392939. The next prime is 128392961. The reversal of 128392943 is 349293821.

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

It is not a de Polignac number, because 128392943 - 22 = 128392939 is a prime.

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 128392943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128392963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170918 + ... + 9170931.

It is an arithmetic number, because the mean of its divisors is an integer number (36683700).

Almost surely, 2128392943 is an apocalyptic number.

128392943 is a deficient number, since it is larger than the sum of its proper divisors (18341857).

128392943 is an equidigital number, since it uses as much as digits as its factorization.

128392943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18341856.

The product of its digits is 93312, while the sum is 41.

The square root of 128392943 is about 11331.0609829795. The cubic root of 128392943 is about 504.4835985124.

The spelling of 128392943 in words is "one hundred twenty-eight million, three hundred ninety-two thousand, nine hundred forty-three".

Divisors: 1 7 18341849 128392943