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857193493 = 131931111949
BaseRepresentation
bin110011000101111…
…011110000010101
32012201221221102011
4303011323300111
53223420142433
6221020344221
730146011252
oct6305736025
92181857364
10857193493
113aa955182
121bb0a5071
131087895b0
1481bb6429
15503c33cd
hex3317bc15

857193493 has 16 divisors (see below), whose sum is σ = 1003072000. Its totient is φ = 725423040.

The previous prime is 857193419. The next prime is 857193563. The reversal of 857193493 is 394391758.

It is a de Polignac number, because none of the positive numbers 2k-857193493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857193413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48318 + ... + 63631.

It is an arithmetic number, because the mean of its divisors is an integer number (62692000).

Almost surely, 2857193493 is an apocalyptic number.

It is an amenable number.

857193493 is a deficient number, since it is larger than the sum of its proper divisors (145878507).

857193493 is a wasteful number, since it uses less digits than its factorization.

857193493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112012.

The product of its digits is 816480, while the sum is 49.

The square root of 857193493 is about 29277.8669475766. The cubic root of 857193493 is about 949.9329566722.

The spelling of 857193493 in words is "eight hundred fifty-seven million, one hundred ninety-three thousand, four hundred ninety-three".

Divisors: 1 13 19 31 247 403 589 7657 111949 1455337 2127031 3470419 27651403 45115447 65937961 857193493